Solving Photon Problems: Energy Conservation Questions

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In summary, the conversation discusses the energy of a photon and the potential contradiction with the conservation of energy when considering the Doppler effect of a source moving away from a receiver. The question is posed whether this argument is true and what consequences it would have on energy conservation if it were wrong. The conversation also brings up a similar scenario with a ball's kinetic energy in relation to its reference frame.
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vietcuong
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the energy of photon is given e=hf, but when we consider this with doppler effect of the source goes far away from the receiver.it seems that the energy of photon is decreased. (which contradicts the conservation of energy
in reality :is this argument true?
if it happened, what would result with the conservation of energy
if it were wrong , how can we reject our calculations and expression
 
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  • #2
vietcuong said:
the energy of photon is given e=hf, but when we consider this with doppler effect of the source goes far away from the receiver.it seems that the energy of photon is decreased. (which contradicts the conservation of energy
in reality :is this argument true?
if it happened, what would result with the conservation of energy
if it were wrong , how can we reject our calculations and expression

The energy of a ball moving with velocity v is [tex] 1/2 mv^2[/tex]. Yet, if you're moving in the same reference frame of the ball, the ball has no KE. Do you think there's an energy conservation violation here too?

Zz.
 
  • #3


The argument that the energy of a photon decreases due to the Doppler effect is not entirely accurate. While it is true that the frequency and wavelength of a photon can change due to the relative motion of the source and receiver, the energy of the photon remains constant. This is because the energy of a photon is directly proportional to its frequency, so as the frequency changes, the energy changes in the same proportion.

The conservation of energy holds true in all situations, including the Doppler effect. If the energy of a photon were to decrease, it would violate the fundamental law of conservation of energy. This would have significant implications for our understanding of the universe and the laws of physics.

If our calculations and expressions were found to be incorrect, we would need to re-evaluate our understanding and theories. This is the nature of science - it is constantly evolving and refining as new evidence and information becomes available. We can reject our calculations and expressions if they do not align with experimental observations or if they lead to contradictions with established laws and principles.

In conclusion, the idea that the energy of a photon decreases due to the Doppler effect is not supported by current scientific understanding. The principle of conservation of energy remains valid, and any discrepancies in calculations or expressions can be corrected through further research and experimentation.
 

What is the law of conservation of energy?

The law of conservation of energy states that energy cannot be created or destroyed, but can only be transformed from one form to another. This means that the total energy in a closed system remains constant.

How does this law apply to photon problems?

The law of conservation of energy applies to photon problems because photons are particles of energy. This means that the total energy of the photons in a system must remain constant, even as they undergo transformations such as absorption, emission, or scattering.

What is the formula for calculating photon energy?

The formula for calculating photon energy is E = hf, where E is the energy of the photon, h is Planck's constant (6.626 x 10^-34 joule seconds), and f is the frequency of the photon.

Can photon energy be converted into other forms of energy?

Yes, photon energy can be converted into other forms of energy through various processes such as photoelectric effect, Compton scattering, and pair production. This conversion is in accordance with the law of conservation of energy.

How can I use the law of conservation of energy to solve photon problems?

To solve photon problems using the law of conservation of energy, you need to identify all the sources of energy in the system and track how that energy is transformed or conserved through various processes. This will help you determine the final energy state of the system and solve for any unknown variables.

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