Which event happens as the amplitude of a light wave increases?
A. The light appears more violet.
B. The light appears dimmer.
C. The light appears brighter.
D. The light appears more red.

Answer:

Thus, astronomers can identify what kinds of stuff are in stars from the lines they find in the star's spectrum. This type of study is called spectroscopy. ... From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

Explanation:

Scientists use spectroscopy to identify the elements present in stars by analyzing the light they emit. The distinct atomic spectra for each element acts as a fingerprint, allowing astronomers to understand a star's composition and its evolution over time.

Scientists determine the elements present in different stars by using spectroscopy to analyze the light those stars emit. Each chemical element has a unique atomic spectrum, either emitting or absorbing specific wavelengths of light, identifiable through spectroscopic techniques. By comparing the observed spectra with known spectra obtained in laboratories, astronomers can deduce the elements that make up a star. Stars primarily consist of hydrogen and helium, but the presence of heavy elements, such as iron, varies, offering insight into their composition and history.

The study of light elements like lithium, beryllium, and boron in stars, as compared to heavier ones, can illuminate the processes of stellar evolution and the creation of new stellar and planetary bodies. Information from stars' spectra, including subtle shifts due to Doppler effect adjustments for radial velocity, allows scientists to understand not only a star's chemical makeup but also its motion in space. Thus, spectroscopy is a powerful tool for uncovering the secrets of celestial bodies, from individual stars to distant galaxies.

Answer:

D. impossible to estimate

Explanation:

According to the doppler effect, the frequency of the wave will increase.

let u be the speed of the submarine,

let the speed of sound in water be c,

let initial frequency of the sent out wave be f,

let frequency of received wave be f'

The distance occupied by the new wave will be (c - u), therefore, the new wavelenght will be (c - u)/f

Frequency = speed of sound ÷ wavelenght

therefore the new Freq f' will be

f' = cf/(c - u) which will be shorter than the initial wavelenght.

But we do not know the speed of the submarine, so we can't estimate.

Answer:

while using brainly app. there is an option of uploading image of diagram, graph or plot. plz use that feature to upload image of the standing wave so that your question can be properly answeres

Answer:

hypermetropia

Explanation:

long-sightedness.

Answer:

[tex]\dot{W_{H} } = 4244.48 Btu/h[/tex]

Explanation:

Temperature of the house, [tex]T_{H} = 70^{0} F[/tex]

Convert to rankine, [tex]T_{H} = 70^{0}+ 460 = 530 R[/tex]

Heat is extracted at 40°F i.e [tex]T_{L} = 40^{0}F = 40 + 460 = 500 R[/tex]

Calculate the coefficient of performance of the heat pump, COP

[tex]COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67[/tex]

The minimum power required to run the heat pump is given by the formula:

[tex]\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\[/tex]...............(*)

Where the heat losses from the house, [tex]\dot{Q_{H} } = 75,000 Btu/h[/tex]

Substituting these values into * above

[tex]\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h[/tex]

Answer:

Genetic Engineering: the direct manipulation of an organisms genes using biotechnology (ex. genetically engineering corn to be insect resistant)

Cloning: The process of producing genetically identical individuals of an organism either natually or artificially,cloning allows for the creation of multiple copies of genes, expression of genes, and study of specific genes (ex. Cloning cells for untreatable diseases)

Artificial Selection: Also known as Selective breeding it is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits/ characteristics (ex. Dog breeding)

Answer:

Genetic Engineering :

Benefits

-Ability to create food that is resistant to pests, cold, and disease

-Greater food production volume and increased vitamins

Risks

-Concerns about long-term health risks

-Lack of regulation

Cloning

Benefits

-Ability to increase endangered animal populations

-Possibility of eliminating diseases and defective genes

Risks

-Shorter lifespan for cloned animals

-Greater chance of health issues for cloned animals

Artificial Selection

Benefits

-Allows for selection of desired traits

-Ability to create better versions of organisms

Risks

-Loss of genetic diversity

-Increased chance of diseases that can shorten lifespan

Explanation:

This is straight from the lesson 6.01 page 5 (FLVS)

Answer:

Purple

Explanation:

They've all gone for the same amount of time, but purple is pointed the highest

pls vote me brainliest

Answer:

In summary the blanket that is metallic reflects electromagnetic waves

Explanation:

The teacher running the marathon generates a quantity of heat that the body must release to keep its temperature constant, one of the ways to release this energy in the form of electromagnetic radiation in the infrared range.

The matte with is silver should be metallic, so it reflects light at all wavelengths, so that the infrared light returns to the body and decreases the radiation radiation emitted, thus keeping it warmer.

In summary the blanket that is metallic reflects electromagnetic waves

Answer:

Magnitude (in kilogram) of the resultant force, [tex]|M| = 1958.53 kg[/tex]

Direction = 164.37°

Explanation:

The two forces exerted by the two tugboats are non zero vectors, therefore they can be expressed as:

For the 1620 kg tugboat in the direction N35degrees​W

[tex]M_{1} = 1620 cos \theta_1 i + 1620 sin \theta_1 j\\[/tex]

The direction of the force from the positive x - axis, [tex]\theta_1 = 90 - 35 = 55^{0}[/tex]

The equation above then becomes:

[tex]M_{1} = 1620 cos 55 i + 1620 sin 55 j\\ M_{1} = (1620 * 0.57) i + (1620*0.82) j\\M_{1} = 923.4 i + 1328.4j[/tex]

For the 1250 kg tugboat in the direction S50degrees​W

[tex]M_{2} = 1250 cos \theta_2 i + 1250 sin \theta_2 j\\[/tex]

The direction of the force from the positive x - axis,

[tex]\theta_2 = - (90 - 50) = - 40^{0}[/tex]

The equation above then becomes:

[tex]M_{2} = 1250 cos(-40) i + 1250 sin (-40) j\\ M_{2} = (1250 * 0.77) i - (1250*0.64) j\\M_{2} = 962.5 i - 800j[/tex]

The resultant vector will be given by:

[tex]M = M_{1} + M_{2} \\ M = 923.4 i + 1328.4j + 962.5 i - 800j\\M = 1885.9i + 528.4j[/tex]

The magnitude of the resultant is given by:

[tex]|M| = \sqrt{1885.9 ^{2} + 528.4^2 } \\|M| = \sqrt{3556618.81 + 279206.56}\\|M| = \sqrt{3835825.37} \\|M| = 1958.53 kg[/tex]

The direction will be given by :

[tex]cos \theta = \frac{a}{|M|} \\cos \theta = \frac{1885.9}{1958.53}\\cos \theta = 0.963\\\theta = cos^{-1} 0.963\\\theta = 15.63^0[/tex]

Direction = 180 - 15.63 = 164.37°

Answer:

The frequency the cyclist observes is 1029.412 Hz

Explanation:

Here we have that the frequency is given by the relation;

[tex]f_{obs} = f_{source}\left (\frac{v \pm v_{obs}}{v \pm v_{source}} \right )[/tex]

Where:

[tex]f_{obs}[/tex] = Frequency sensed by the observer

[tex]f_{source}[/tex] = Frequency emitted by the source = 1,000 Hz

v = Velocity of sound in air

[tex]v_{obs}[/tex] = Speed of observer = + 10 m/s

[tex]v_{source}[/tex] = Speed of source  = 0 m/s

Plugging in the values, we have;

[tex]f_{obs} =1000 \times \left (\frac{340 + 10}{340 + 0} \right ) = 1000 \times \left (\frac{350}{340 } \right ) = 1029.412 \ Hz[/tex]

Therefore, the frequency the cyclist observes = 1029.412 Hz.

The phenomenon described in the question is known as the Doppler Effect, used to explain why a moving observer perceives a change in frequency. Given the conditions in the problem, the cyclist would perceive the siren's frequency to be approximately 1029.4 Hz instead of 1000 Hz.

The phenomenon described in the question relates to the Doppler Effect, which involves a change in frequency of a wave (in this case, sound) due to the relative motion between the source of the wave and the observer.

When the observer is moving towards the source of a sound, the frequency they perceive is higher than the actual frequency of the sound. This perceived frequency (f') can be calculated using the formula:

f' = f * (v + vo) / v

Where: f is the actual frequency, v is the speed of sound, and vo is the speed of the observer (cyclist).

Substituting the given values:

f' = 1000 Hz * (340 m/s + 10 m/s) / 340 m/s = 1029.4 Hz

Therefore, the cyclist will observe a frequency of approximately 1029.4 Hz.

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Answer:

514.5 meters

1687.9921 feet

Explanation:

speed of sound = 343 m/s

1.5 (seconds) x 343 (m/s) = 514.5 meters

The distance of the lightning strike is approximately 514.5 meters or 0.5145 kilometers away, calculated by multiplying the time delay of the thunder clap (1.5 seconds) with the average speed of sound (343 m/s).

If a thunder clap comes 1.5 seconds after a lightning strike, you can estimate the distance of the strike from your location. Since the speed of sound varies with temperature, we'll use the average speed of sound at room temperature, which is approximately 343 meters per second. To calculate the distance, you multiply the time it takes to hear the thunder (1.5 seconds) by the speed of sound (343 m/s), which equals to about 514.5 meters or roughly 0.5145 kilometers away.

Answer: it is period 93

Explanation:

The period of a wave, measured in seconds, is the reciprocal of its frequency. Given that a piano note vibrates at a frequency of 262 times per second, the period of the wave is approximately 1/262 or 0.00381 seconds.

In physics, the frequency is the number of waves that pass a fixed point in a given time period. We typically measure it in hertz (Hz), which is synonymous with cycles per second. On the other hand, the period is the duration it takes for one cycle to pass, which is the reciprocal of the frequency.

Here the note on the piano is stated to vibrate (frequency) 262 times per second. Thus, to calculate the period, we take the reciprocal of the frequency i.e. 1 divided by the frequency. Hence, it's 1/262 which equals approximately 0.00381 seconds. So, the period is about 0.00381 seconds.

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Answer:

Explanation:

Mechanical Advantage of a wheel and axle is defined as the ratio of the load on the axle to the effort applied on the wheel. It can also be described as the ratio of the radius of the wheel (larger radius) to the radius of the axle (smaller radius).

Mechanical advantage = Load/ Effort = R/r

Given the wheel radius as 4 inches and the axle radius as 0.25 inches.

MA = R/r = 4/0.25

MA = 16

Mechanical advantage of the wheel and axle is 16

b) Using the formula Mechanical Advantage = Load/ Effort

Given MA = 16, Effort = 16lbs, Load =?

On substitution, 16 = Load/6

Load = 16*6

Load = 96lbs

The resistance force that can be overcomed with the effort is 96lbs

Answer:

Magnetic domains

Explanation:

The areas in which the individual magnetic orientations of atoms line up are called magnetic domains.

In most magnetic materials, atoms are arranged in such a way that the magnetic orientation of one electron cancels out the orientation of another

In magnetic domain electrons have the same magnetic orientation. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.

Answer:

1/ How do scientists determine the elements present in different stars?

KEY WORD for the main idea: Analysis of the starlight.

Answer: Scientists can identify what elements present in different stars by analysing the starlight.

Note: The "starlight" = spectral lines. Astronomers can can identify what kinds of stuff are in stars from the lines they find in star's spectrum. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

..

2/ What happens to a star when the fuel for its nuclear fusion reactions is exhausted?

KEY WORD for the main idea: generate light from energy

Answer: A star generates energy through nuclear fusion; this energy is released a light and heat.

Note: The energy source for all stars is nuclear fusion. Stars spend most of their lives repetitively compressing two hydrogen atoms into a single helium atom - plus a lot of energy, which is released as light and heat. A normal star that has exhausted the nuclear fuel in its interior, its outer layers have expanded, and it has become a red giant.

....

3/ Why aren't stars and galaxies spread out evenly across the universe?

KEY WORD for the main idea: Gravitational attraction

Answer: Stars and Galaxies aren't evenly distributed uniformly throughout the universe, because of the existance of gravity.

Note: Gravity, as one of the fundamental forces of the universe, is the powerful force that glues our universe together. This is the one that causes every object in the universe to attract every other object. One of the most noticeable effects of gravity in the solar system is the orbit of the planets.

Explanation:

Hope this answer can help you. Have a nice day !

Answer:

Internal hardware is physical parts that help the computer work; software is the programs and applications that make the computer work.

Explanation:

Credit to the guy above me

The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.

The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, such as the motherboard, processor, memory, and storage devices, that are housed inside the computer's casing. These components work together to enable the computer to perform tasks.

On the other hand, software refers to the intangible programs and applications that are installed on the computer and instruct the hardware on how to perform specific tasks.

For example, the operating system (e.g., Windows, macOS, Linux) is a type of software that manages and controls the computer's hardware, allowing users to interact with the computer and run other software applications.

Applications like word processors, web browsers, and media players are also examples of software that users can install and use on their computers.

In summary, internal hardware comprises the physical components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.

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kenetic and potential

Answer:

2.4m/s^2

Explanation:

To find the acceleration you divide velocity by the time.

Answer:

B - Opposite, and direct

The word inverse means c) opposite and is an alternative word for indirect relationship.

In mathematics, this often refers to a situation where one value increases while the other decreases, creating a contrasting effect between the two variables.

Types of Relationships: When discussing relationships between variables:

A direct relationship means that as one variable increases, the other variable also increases.

An inverse relationship, on the other hand, indicates that as one variable increases, the other decreases.

In this context, the question asks for an alternative word for inverse relationships. The correct option would be that it is an alternative word for an indirect relationship since as one variable goes up, the other goes down, highlighting the opposite effect.

The direction of the induced magnetic field will be the same as the direction of the external magnetic field.

As per Felhming's right-hand rule: The direction of the magnetic field is perpendicular to the wire and is in the direction of the fingers of your right hand.

The direction of induced current in the coil is clockwise. Since the magnet is being moved away, the magnetic flux linked with the coil must be decreasing. Hence the induced magnetic field must be in the same direction as the external magnetic field.

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Answer:

the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time

Explanation:

Answer:

Due to gravity on the earth but on moon there is 1/6th of the gravity than on earth. Since the acceleration of gravity Is lesser in moon and weight is constant, the weight of an object is lesser on the surface of the moon.

Explanation:

Answer: C.

The gravitational pull of Earth is greater than that of the Moon.

Explanation: plato

Answer: B. The last quarter. Half of the moon's surface will be visibly illuminated.

Answer:

B. Last Quarter

Hi,  

All of it is true. :

Uranus is a pale green planet, with 27 satellites and several rings.

Astronauts must have their own supply of oxygen in their spacesuits during spacewalks due to the absence of breathable air in the vacuum of space, and to protect them from harmful solar radiation and the extreme temperatures of space. The suits also maintain positive pressure relative to the outside to prevent air from the vacuum of space from entering the suit if a leak occurs.

Astronauts must have their own supply of oxygen within their spacesuits during spacewalks because outer space does not have an atmosphere like the Earth which contains beneficial and breathable air; instead, space is a vacuum. This absence of atmosphere leaves astronauts exposed to the direct speed and force of solar radiation which can be harmful and potentially lethal. Their spacesuits, equipped with their own oxygen supply, not only enable astronauts to breathe but also serve as a barrier to protect them from this radiation and the extreme temperatures of space. The suit also maintains a positive pressure relative to the outside, ensuring that if a leak occurs, air will flow out of the suit, not into it from the vacuum of space.

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Convex Mirrors are the mirrors that are used for  security purposes.

Convex Mirrors are the type of mirrors that are used in road safety, security and observation applications. For example, convex security mirrors act as effective deterrents when used in shops and convex safety mirrors help to avoid collisions.

So we can conclude that Convex Mirrors are the mirrors that are used for  security purposes.

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The Convex mirror is the mirror that is generally used for security purposes (Option A and B).

The term mirror refers to any reflecting surface. There are different kinds of curved mirrors such as;

The Convex mirror is used for security purposes because they help to magnify the image and broaden the scope of view allowing the store attendants to see better.

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When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

The motion of charged particles like electrons in a magnetic field is governed by the Lorentz force equation:

F = q * (v x B)

where:

F is the magnetic force acting on the electron,

q is the charge of the electron,

v is the velocity of the electron,

B is the magnetic field vector.

Since the velocity of the electron (v) is in the positive x-direction, and the magnetic field (B) is in the positive z-direction, the cross product (v x B) will result in a force perpendicular to both the x and z axes. This force causes the electron to move in a circular path around the z-axis.

This motion is commonly referred to as circular motion in a magnetic field, and it is similar to the way charged particles move in a cyclotron or a particle accelerator. The electron will continue to move in this circular path as long as it remains in the region with the uniform magnetic field and no other forces act on it.

Hence, When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

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When 20 J of work is done in 4 seconds, the power is 5 watts

Power is the rate at which work is done, expressed in watts.

In this case, if 20 J of work is done in 4 seconds, the power can be calculated as follows:

Power = Work done / Time taken

Power = 20 J / 4 s

= 5 watts