Photon Energy: Frequency and Height in a Well

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SUMMARY

The discussion centers on the energy dynamics of a photon falling into a well of height x meters. It is established that the energy of a photon is defined by the equation E = hf, where h is Planck's constant and f is the frequency. Despite the gravitational potential energy gain of mgx, the mass of the photon is zero, leading to the conclusion that its energy remains constant during the fall. The conversation emphasizes the importance of conservation of energy in understanding the behavior of photons in gravitational fields.

PREREQUISITES
  • Understanding of photon energy, specifically E = hf
  • Basic knowledge of gravitational potential energy (mgx)
  • Familiarity with the concept of mass-energy equivalence
  • Knowledge of conservation of energy principles
NEXT STEPS
  • Research the implications of mass-energy equivalence in quantum mechanics
  • Explore gravitational effects on light, specifically in general relativity
  • Study the relationship between frequency and energy in photons
  • Investigate how gravitational potential energy is calculated in different contexts
USEFUL FOR

Students of physics, particularly those studying quantum mechanics and general relativity, as well as educators looking to explain the behavior of photons in gravitational fields.

Gyroscope

Homework Statement


A photon of frequency f falls in a well x meters of height. What is the energy of the photon when it is at the bottom of the well.

The energy of a photon is hf. It would gain mgx for falling in the well, but since his mass is zero, the energy remains the same. Isn't it?


Homework Equations





The Attempt at a Solution

 
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If you think about conservation of energy, it would clearly have to gain the same amount of energy as a mass of size hf/c^2. Otherwise, converting energy to mass, dropping it and converting back to energy would leave you with a puzzling balance sheet.
 

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