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- E=MC^2 Explained: Photon Mass Energy - Physics Forums
But a photon can't have ##p = 0##, because it can never be a rest; it always moves at the speed of light, so it always has momentum In fact, as you can see from considering the general formula when ##m = 0##, a photon's momentum is just its energy divided by ##c##
- Derivation of the photon energy - Physics Forums
Hi everyone, Anybody knows if the photon energy (frequency * Planck's constant) can be derived from more basic physical principles or this formula was "invented" to explain the photo-electric effect or black body radiation? If you know a way to derive it, please share Thanks a lot !
- How to Verify the Energy of a Scattered Photon Formula? - Physics Forums
An electron of mass 'm' and speed 'v' collides with a gamma ray photon of initial energy hf 0, as measured from the laboratory frame The photon is scattered in the electron's direction of travel Verify that the energy of the scattered photon, as measured in the laboratory frame, is:
- Why is Photon Energy Quantized in Terms of Sine Wave Frequency?
The formula E=hν intriguingly ties the energy of a photon directly to the frequency of the EM wave it is associated with What captivates me is the peculiar coincidence that the energy of photons, the quantum particles of light, is related to the frequency of the harmonic components of the EM wave they constitute
- Understanding Recoil Kinetic Energy in Atomic Emission: Fact or Fiction?
A photon's momentum and energy satisfy the relation E=cp (this is probably your missing ingredient) Therefore, the photon has p = (E1-E2) c The atom now has momentum -p by conservation of momentum and its kinetic energy is given by Kr = (1 2)M v^2 = (1 (2M)) p^2 Substituting the expression for p from above leads to the answer you seek dhris
- Photon Kinetic Energy: Wavelength Frequency - Physics Forums
How is a photon's energy determine in relation to it's wavelength and frequency? For example, 20hz vs 400ghz electromagnetic waves The energy of a photon, E (which can be considered as all kinetic energy since the proper energy = E 0 = 0 and E = K + E 0 = K), is related to the photon's frequency, f, by E = hf where h = Planck's constant = 6
- In the formula E=nhf for a photon, what is n - Physics Forums
In the formula E=nhf for a photon, what is "n"? In the formula E=nhf for a photon, what is "n"? The number of photons? or the energy level?
- Planck formula and density of photons - Physics Forums
The formula in the book is number of photons per volume per unit energy, thence the difference by a Planck's constant The refractive index does have to be included in the formula It changes the density of states for photons in the material Yes, the book formula is derived for a solid material, not vacuum
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