What is velocity of photon ?
What is velocity of photon ?
Similar Questions
Two sources of light emit with a power of $200 \mathrm{~W}$. The ratio of number of photons of visible light emitted by each source having wavelengths $300\ \mathrm{nm}$ and $500 \mathrm{~nm}$ respectively, will be :
Two sources of light emit with a power of $200 \mathrm{~W}$. The ratio of number of photons of visible light emitted by each source having wavelengths $300\ \mathrm{nm}$ and $500 \mathrm{~nm}$ respectively, will be :
- [JEE MAIN 2024]
Monochromatic light of wavelength $ 632.8\; nm$ is produced by a helium-neon laser. The power emitted is $9.42 \;mW$.
$(a)$ Find the energy and momentum of each photon in the light beam,
$(b)$ How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and
$(c)$ How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
Monochromatic light of wavelength $ 632.8\; nm$ is produced by a helium-neon laser. The power emitted is $9.42 \;mW$.
$(a)$ Find the energy and momentum of each photon in the light beam,
$(b)$ How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and
$(c)$ How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
For photoelectric emission, tungsten requires light of $ 2300 \mathring A$. If light of $1800 \mathring A $ wavelength is incident then emission
What is photoelectron ?
What is photoelectron ?
The photoelectric cut-off voltage in a certain experiment is $1.5 \;V. $ What is the maximum kinetic energy of photoelectrons emitted?
The photoelectric cut-off voltage in a certain experiment is $1.5 \;V. $ What is the maximum kinetic energy of photoelectrons emitted?