# What happens to the energy of light when it is red-shifted?

## What happens to the energy of light when it is red-shifted?

A photon’s energy is inversely proportional to it’s wavelength. As it becomes red-shifted, it’s wavelength becomes larger so it’s energy becomes smaller.

## Does a photon ever lose energy?

Photons carry energy, but they don’t lose energy just because they travel. The key to understanding the dilemma of a red-shifted photon is that not all observers will measure the same energy of the photon. The energy of a photon comes from its frequency, and that is different for different observers.

Does redshift violate conservation of energy?

The redshift from distant galaxies is do to motion/acceleration, it is simply a result on light of the objects effecting the light. That effect, redshifted light, does not violate the Law of Conservation of Energy/Matter/Mass etc.

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### How does a photon change frequency?

The frequency of photon changes due to GRAVITATIONAL RED SHIFT or EINSTEIN SHIFT. Yes, The frequency of photon changes due to GRAVITATIONAL RED SHIFT or EINSTEIN SHIFT.

### Does red shifted light have less energy?

The photon energy hasn’t changed, but yours has, so your measurement of the photon energy has reduced. At the higher elevation there’s less gravitational time dilation. Your clocks are now going faster than they were, so you measure the selfsame photon energy as reduced.

Why do photons red shift?

In the widely accepted cosmological model based on general relativity, redshift is mainly a result of the expansion of space: this means that the farther away a galaxy is from us, the more the space has expanded in the time since the light left that galaxy, so the more the light has been stretched, the more redshifted …

#### When frequency increases the energy of a photon?

From this equation, it is clear that the energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. Thus as frequency increases (with a corresponding decrease in wavelength), the photon energy increases and visa versa.

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#### When you change the energy what happens to the frequency?

2 Answers. Daniel H. Energy increases as the wavength decreases and the frequency increases.

Does light lose energy when reflected?

Each reflected photon has the same energy as before. Some colors may be preferentially absorbed or reflected. So a beam may lose energy and change color when some of it is reflected from a colored surface. Light may lose or gain energy on being reflected from a moving mirror because of the Doppler shift.

## Where does the light energy go?

A: Yes, the light energy usually initially goes into raising some electrons from low-energy states to high-energy states. What happens next depends on the material. Often the electrons settle down, dumping their energy as heat, just thermal shaking of the atoms in the material.

## What happens to electrons when red light is shifted?

Also related to the red shifted light subject: Electrons emit and absorb energy in quantum values. However, after an adequate amount of red shifting, photons of a given emission will lose the ability to excite the same (equivalent) electron to that higher energy state.

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What is the energy loss of red shift photons?

Redshifted photons are time dilated, so no net energy loss – er, what jonathan said. For gravity, red shift or blue shift is NOT due to any change in frequency of the photons, but is rather due to the time rates being different for observers in different potentials.

### What happens when radio waves are redshifted?

So, if radio waves are shifted into the ultraviolet part of the spectrum, they are said to be redshifted — shifted toward the lower frequencies. The redshift of an object is measured by examining the absorption or emission lines in its spectrum. These lines are unique for each element and always have the same spacing.

### What is the difference between blueshift and redshift in sound waves?

Sound and light. The terms redshift and blueshift apply to any part of the electromagnetic spectrum, including radio waves, infrared, ultraviolet, X-rays and gamma rays. So, if radio waves are shifted into the ultraviolet part of the spectrum, they are said to be redshifted — shifted toward the lower frequencies.