Answer: Option (a) is the correct answer.
Explanation:
Elements of group 17 are fluorine, chlorine, bromine, iodine and astatine. And, it is known that size of elements increases on moving down the group due to increase in number of electrons.
Since, atomic number of fluorine is 9 and its electronic distribution is 2, 7. So, it needs just one more electron to stabilize itself and fluorine has the smallest size as compared to rest of the atoms of its group so, it has the ability to attract an electron more strongly towards itself.
Also, due to small size nucleus of fluorine is able to pull electrons strongly towards itself. As a result, there will be increase in its reactivity.
Thus, we can conclude that the most reactive non-metal elements are found on the periodic table at the top of group 17.
What do peaked roofs, convertible tops, and airplane wings have in common when air moves faster across their top surfaces?
Adele is planning to paint the walls in her room over spring break. she studies several color samples and is trying to decide between yellow, green, and blue hues. what light wave attribute allows adele to differentiate between these colors?â
a. âthe amplitude of waves
b. âthe wavelength of the waves
c. âthe number of waves
d. âthe types of waves
Final answer:
The correct option is (b) the wavelength of the waves. Adele can differentiate between colors based on the wavelength of light waves. Color perception is linked to light's wavelength, with blue having shorter wavelengths, and red longer wavelengths. Therefore, wavelength is key in distinguishing between colors.
Explanation:
Adele is able to differentiate between the colors yellow, green, and blue in her room because of the wavelength of the light waves. Light that is visible to humans makes up only a small portion of the electromagnetic spectrum, and within this spectrum, color perception is directly linked to wavelength.
Longer wavelengths are associated with the color red, intermediate wavelengths with green, and shorter wavelengths with blue and violet colors. This explains why Adele perceives different colors, as each hue represents light of a specific range of wavelengths.
Thus, the correct answer to what light wave attribute allows Adele to differentiate between these colors is b. the wavelength of the waves.
When organizing colors by wavelength, from shortest to longest, it goes from blue to yellow to red. Conversely, when arranging according to frequency, which is inversely related to wavelength, the order is red (lowest frequency), yellow, and then blue (highest frequency).
This demonstrates the inverse relationship between wavelength and frequency in the electromagnetic spectrum.
What is the approximate weight of a 400 kg object?
You have to convert it to newtons so:
4,000 N
In a hydrogen atom, a ____________ transition occurs ____________ because nature does not like to be in a higher energy state.
Why is knowing only a hurricanes speed not enough information to be able to warn people to evacuate
Only a hurricanes speed is not enough information to be able to warn people to evacuate.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.
Only knowing a hurricane's speed is insufficient information to issue an evacuation warning because the speed does not reflect the strength of the hurricanes, and the speed of the hurricanes does not tell anything about the directional, movement of the hurricanes as we know the speed is a scalar quantity which does not tell anything about the direction of the moving object.
Thus, only knowing a hurricane's speed is insufficient information to issue an evacuation warning.
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*asap*
Explain how waves, energy and matter are related.
How many electrons do carbon and oxygen share?
A carbon atom and an oxygen atom share four electrons in a double covalent bond in a molecule of carbon dioxide to achieve stability.
Explanation:The carbon and oxygen atoms share electrons through covalent bonding, which is a type of chemical bond where atoms share pairs of electrons. In the case of carbon dioxide (O=C=O), a molecule consisting of a single carbon atom and two oxygen atoms, there are two double covalent bonds to achieve stability. Each double bond involves the sharing of two pairs of electrons (four electrons in total) between the carbon and oxygen atoms. Hence, this indicates that a carbon atom and an oxygen atom share four electrons in a double covalent bond.
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The imaginary line from the tip of the football to the football to the sideline is called
The line is a conceptual 'line of sight' from the football to the sideline, and a yard, used for measurements on the field, is equal to three feet; this standardization ensures fairness in football games.
The imaginary line from the tip of the football to the sideline in a football game is often referred to as a line of sight or simply directional line. This is not a technical term defined in the rules of football, but rather a conceptual way to describe that specific direct path. When discussing measurements within the context of a football field, it is important to understand the length of a yard. A yard is a standard unit of linear measure equal to three feet. Moving the ball ten yards leads to a first down and this distance is consistent across all professional football fields, ensuring the game's uniformity.
Explain the difference between speed and velocity and indicate if these are scalar or vector quantities.
Answer:
Velocity is a speed with a direction vector associated with it speed is just a displacement per unit of time which makes it scalar
Explanation
A 66-kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11 m/s.
I believe this question ask for the energy dissipated by friction.
The overall energy equation for this is:
F = PE – KE
where F is friction loss, PE is potential energy = m g h, KE is kinetic energy = 0.5 m v^2
F = 66 kg * 9.8 m/s^2 * 170 m – 0.5 * 66 kg * (11 m/s)^2
F = 105,963 J ~ 106,000 J
A total of 1.1 × 10⁵Joules energy was dissipated by friction
[tex]\texttt{ }[/tex]
Further explanationLet's recall Kinetic Energy Formula as follows:
[tex]Ek = \frac{1}{2}mv^2[/tex]
Ek = Kinetic Energy ( Joule )
m = mass of the object ( kg )
v = speed of the object ( m/s )
Let us now tackle the problem !
[tex]\texttt{ }[/tex]
Complete Questions:
A 66-kg skier starts from rest at the top of a 1200-m long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11.0 m/s. How much energy was dissipated by friction?
Given:
mass of skier = m = 66 kg
height of trail = h = 170 m
velocity of skier = v = 11.0 m/s
Asked:
work done by friction = W = ?
Solution:
[tex]W = Ep - Ek[/tex]
[tex]W = mgh - \frac{1}{2}mv^2[/tex]
[tex]W = 66(9.8)(170) - \frac{1}{2}(66)(11.0)^2[/tex]
[tex]W = 109956 - 3993[/tex]
[tex]W = 105963[/tex] [tex]\texttt{ J}[/tex]
[tex]W \approx 1.1 \times 10^5 \texttt{ J}[/tex]
[tex]\texttt{ }[/tex]
Conclusion:A total of 1.1 × 10⁵ Joules energy was dissipated by friction
[tex]\texttt{ }[/tex]
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Answer detailsGrade: High School
Subject: Physics
Chapter: Dynamics
Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave background (CMB)?
Answer: Plato users - B. radio telescope
Explanation: just took test
X ray photons have a _____ wavelength, _____ frequency, and _____ energy than do ultraviolet photons. x ray photons have a _____ wavelength, _____ frequency, and _____ energy than do ultraviolet photons. shorter, higher, lower longer, higher, higher shorter, higher, higher longer, lower, lower shorter, lower, higher longer, lower, higher
Some of the terrestrial planets trap solar radiation in their atmospheres which heats the surface of the planet this process is called
What phenomenon causes the fuzzy image? What kind of lens is used to correct this, and how is it corrected?
Answer:
This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focuses at a common point.
Explanation:
This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focus at a common point.
What is chromatic aberration ?"Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength. There are two types of chromatic aberration: axial chromatic aberration and lateral chromatic aberration."
What is wavelength ?"Wavelength is the distance travelled by a particle on the wave when it completes one oscillation. Meters (m) is the SI unit. "Amplitude is the maximum distance covered by the particle from its mean position. The number of oscillations completed in unit time is known as frequency.
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Brian stresses a mineral. It breaks cleanly and evenly, leaving a smooth surface. The cleavage can be described as _____.
none
perfect
poor
metallic
The answer is B. Perfect.
A person on another planet shines a flashlight at you. The planet and the earth are both in the same reference frame and are not moving relative to each other. At the same instant that the person shined the flashlight at you, a person on a spaceship passing that planet and moving toward you at 0.5 c also shined a flashlight at you. Which light pulse will reach you first?
A. the light from the person on the planet
B. the light from the flashlight on the spaceship
C. the two light pulses will reach you at the same time.
The light pulse that will reach you first is: (C). the two light pulses will reach you at the same time.
Meaning of light and light pulseLight according to physics can be defined as electromagnetic radiations that are visible to the eyes. Light speed in a vacuum is always constant and currently the speed of light in air is 3 * [tex]10^{8}[/tex] m/s
A light pulse is defined as an optical pulse of flashes of light.
In conclusion, The light pulse that will reach you first is the two light pulses will reach you at the same time, since the light was sent at the same distance.
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A spectrum containing radiation of specific wavelengths is called a __________.
According to the definition of mechanical work, pushing on a rock accomplishes no work unless there is
According to the definition of mechanical work, the pushing on a rock accomplishes no work done unless there is a movement in the same direction as the direction of the force.
What is Mechanical work?Mechanical work is the amount of energy which is transferred by a force that is applied on the object. Like that of other energies, it is a scalar quantity, with the SI units of joules. The heat conduction is not considered to be a form of work done, since there is no macroscopically measurable force, only microscopic forces occurring in atomic collisions.
According to the definition of mechanical work, the pushing on a rock accomplishes no work unless there is a movement in the same direction as that of the direction of the force applied.
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What happens to the gravitational force between two objects if their masses do not change but the distance between them becomes four times as much?
You plug in an extension cord and you have to be very careful around electrical outlet. However you can handle his extension cord without worry of being shot by the electrical charge which statement best explains why you can do this
A laser emits light of frequency 4.74 x 1014 hz. what is the wavelength of the light in nm?
The wavelength of the light is approximately 633 nanometers (nm).
What is the wavelength of the light from the laser?Wavelength is simply the distance over which the shapes of waves are repeated. It is expressed as:
λ = c ÷ f
Where λ is wavelength, c is speed of light and f is frequency.
Given the parameter:
Frequency f = 4.74 × 10¹⁴ Hz
Speed of light c = 3.00 × 10⁸ m/s
Wavelength λ =?
Plug the values into the above formula and solve for the wavelength λ:
λ = c ÷ f
λ = (3.00 × 10⁸) ÷ (4.74 × 10¹⁴)
λ = 6.33 × 10⁻⁷ meters
λ = 6.33 × 10⁻⁷ meters × 1,000,000,000
λ = 633 nm
Therefore, the wavelength measures 633 nm.
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Determine the mass of a ball with a velocity of 40.0 m/s and a wavelength of 8.92 Ã 10-34 m.
The mass of the ball is approximately 18.57 grams.
To determine the mass of a ball with a given velocity and wavelength, we can use the de Broglie relation, which states that the wavelength [tex]\( \lambda \)[/tex]of a particle is inversely proportional to its momentum p . The de Broglie relation is given by:
[tex]\[ \lambda = \frac{h}{p} \][/tex]
where h is Planck's constant[tex]6.626 \times 10^{-34} \)[/tex] Js) and p is the momentum of the particle. The momentum can also be expressed as the product of the mass m of the particle and its velocity v :
p = mv
Combining these two equations, we get:
[tex]\[ \lambda = \frac{h}{mv} \][/tex]
Rearranging the equation to solve for mass m , we have:
[tex]\[ m = \frac{h}{\lambda v} \][/tex]
Given:
- Velocity v = 40.0 m/s
- Wavelength[tex]\( \lambda = 8.92 \times 10^{-34} \)[/tex]m
- Planck's constant \[tex]h = 6.626 \times 10^{-34} \)[/tex] Js
Plugging in the values, we get:
[tex]\[ m = \frac{6.626 \times 10^{-34} \text{ Js}}{(8.92 \times 10^{-34} \text{ m})(40.0 \text{ m/s})} \][/tex]
[tex]\[ m = \frac{6.626 \times 10^{-34}}{8.92 \times 10^{-34} \times 40.0} \][/tex]
[tex]\[ m = \frac{6.626}{8.92 \times 40.0} \][/tex]
[tex]\[ m \ =\frac{6.626}{356.8} \][/tex]
[tex]\[ m \ = 0.01857 \text{ kg} \][/tex]
Converting the mass to grams (since 1 kg = 1000 g), we have:
[tex]\[ m \ = 0.01857 \text{ kg} \times 1000 \text{ g/kg} \][/tex]
[tex]\[ m \ =18.57 \text{ g} \][/tex]
A motorcycle running on gasoline wastes a large amount of energy mainly as A) heat energy and sound energy. B) light energy and kinetic energy. C) heat energy and chemical energy. D) sound energy and chemical energy.
A motorcycle mainly wastes energy as heat energy and sound energy. In the engine, chemical energy is transformed into mechanical energy. However, the engine is inefficient and much of the chemical energy is lost as heat energy. Also, some of the energy is transformed to sound energy. This explains why the motorcycle is noisy and has an exhaust pipe.
Answer: it's A this will help you
Explanation:
Which of the following planets has the largest orbital radius? a. Venus c. Neptune b. Earth d. Saturn Please select the best answer from the choices provided A B C D
When the atom's electrons step down to lower energy levels in a thin cloud of hot gas, what is produced?
Answer: The correct answer is an emission line spectrum.
Explanation:
When the electrons are excited to the higher energy level, the energy is absorbed in this case.
When the electrons in the atom step down to lower energy levels in a thin cloud of hot gas then the radiation will emit.
The electron will lose energy in this case in the form of radiation. There will be an emission line spectrum.
When the electrons step down to lower energy level, emission line spectrum produced.
Further Explanation:
The spectrum of emission of an element is spectrum of wavelength of radiation emitted during the transition of electron from a higher energy level to lower energy level. The energy of photon emitted in this process is equal to difference between the two levels. There is possibility of different types of transition for an atom and energy difference is specific for each atom.
When electrons are excited in atom, extra energy forces electrons to higher energy orbital. When electron goes to lower state, energy releases in form of photon. This emitted photon form the emission line spectrum.
Emission is process in which higher energy state of the particle convert into a lower state through the emission of photon, which produces light. The frequency of emitted light is function of transitional energy.
Since energy of system conserved, difference in energy between two states equal to energy carried by photon. The energy state of transitions results in emission of large frequency range.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Modern physics
Keywords:
Electrons, step, lower, energy, levels, thin, cloud, hot, gas, emission, line, spectrum, ground, state, higher, radiation, transition, energy, light and photon.
If the moon were moved twice as far away from the earth, then the gravitational force between them would be _________ as much as it is now.
A driver of a car enters a new 110 km/h speed zone on the highway. the driver immediately begins to accelerate and reaches 110 km/h after driving 500 m. if the original speed was 80 km/h, what was the driver’s acceleration?
The driver's acceleration is approximately 0.08 m/s^2.
Explanation:The driver's initial speed was 80 km/h and he reaches 110 km/h after driving a distance of 500 m. To find the driver's acceleration, we can use the formula:
Acceleration = (Final Speed - Initial Speed) / Time
Since the distance is given, we need to find the time taken.
Using the formula:
Distance = Initial Speed * Time + (1/2) * Acceleration * Time^2
We can substitute the given values (Initial Speed = 80 km/h, Final Speed = 110 km/h, Distance = 500 m) and solve for the time. Once we have the time, we can substitute it back into the first equation to find the acceleration.
After calculating, the driver's acceleration is approximately 0.08 m/s^2.
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which formula represents Gay-Lussac's law?
The formula for this law is P1/T1 = P2/T2. Temperatures must always be expressed in kelvins when using gas laws.
Gay-Lussac's Law, also known as Amontons' law, states that the pressure of a gas is directly proportional to its absolute temperature, provided that the volume and amount of gas remain constant. The mathematical expression for Gay-Lussac's Law is:
P1/T1 = P2/T2
where P1 and P2 are the initial and final pressures, and T1 and T2 are the initial and final absolute temperatures (in Kelvin). This means that if the temperature of a gas increases, its pressure also increases, as long as the volume does not change.
For example, if a gas in a sealed container is heated from 300 K to 600 K, its pressure will double assuming the volume of the container remains constant.
It is important to note that temperatures must always be expressed in kelvins when using gas laws. Gay-Lussac's Law is similar to Charles's Law but focuses on the relationship between temperature and pressure instead of temperature and volume.
What any environmental agent-biological, chemical, or physical-that causes damage.?
An environmental agent can be a biological, chemical, or physical factor causing harm to health and ecosystems, with examples including heavy metals and pesticides like DDT. These agents can cause immediate to long-term damage and may lead to resistance in the target organism. Bioremediation is a strategy used to combat environmental contamination.
Explanation:An environmental agent is a biological, chemical, or physical factor that has the potential to cause harm to humans, ecosystems, or both. Chemical agents, such as heavy metals like mercury, lead, and cadmium, pesticides and endocrine disrupters, contribute significantly to environmental damage and can pose serious health risks. These agents are often by-products of industrial activities and can biomagnify in the food chain, leading to toxic levels in organisms at higher trophic levels, such as swordfish, which can then affect humans who consume them.
Environmental contamination can stem from diverse sources, impacting air, water, and soil. Contaminants can lead to acute or chronic health problems, affecting specific organs, cells, or biochemical pathways in the body. The field of environmental toxicology strives to understand and mitigate these effects, knowing that substances such as DDT and other pesticides have both immediate and long-term ecological consequences, while also becoming less effective over time as pests develop resistance.
Examples of Environmental Agents and Their Impact:
DDT as a chemical agent causing environmental harm and developing resistance in pests.Biological agents like viruses, bacteria, and fungi contributing to the spread of diseases.Endocrine disrupters interfering with hormonal systems causing various adverse health effects.It is vital to address these environmental threats by employing strategies such as bioremediation, using plants to clean up soils from toxic metals, for example, to safeguard human health and protect ecosystems.
identify the part labeled 1, 2, 3, 4, and 5 of the central nervous system.
Answer:
1= Cerebrum.
2=Ventricles
3.Cerebellum.
4.Brain stem
5.Spinal cord.
Explanation: