When a photon enters glass from air,which one | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The energy of a photon is given by $E = h
u$,where $h$ is Planck's constant and $
u$ is the frequency of the photon.When a photon travels from o

Vedclass · Accepted Answer

Energy

Vedclass · Answer

(B) The energy of a photon is given by $E = h
u$,where $h$ is Planck's constant and $
u$ is the frequency of the photon.When a photon travels from one medium to another (e.g.,from air to glass),its frequency $
u$ remains constant because it is determined by the source of the light.Since $E = h
u$ and $h$ is a constant,the energy $E$ of the photon does not change.However,the velocity $v$ of the photon changes as it enters a denser medium,and since $v = 
u \lambda$,the wavelength $\lambda$ also changes.Momentum $p$ is given by $p = E/c$ (in vacuum) or $p = h/\lambda$,which changes as the wavelength changes.Therefore,the energy is the quantity that does not change.

When a photon enters glass from air,which one of the following quantities does $\underline{\text{NOT}}$ change?

Similar Questions

Monochromatic light of frequency $6.0 \times 10^{14} \;Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} \;W$.
$(a)$ What is the energy of a photon in the light beam?
$(b)$ How many photons per second,on an average,are emitted by the source?

An electric bulb of $100 \ W$ power emits photons of wavelength $410 \ nm$ per second. The number of photons emitted per second is: $(h = 6.63 \times 10^{-34} \ J \cdot s, c = 3 \times 10^8 \ m/s)$

The energy of a photon with a wavelength of $450 \, nm$ is ............

When an $X$-ray photon collides with a proton,its frequency:

Find the number of photons emitted per second by a $10 \ kW$ radio transmitter operating at a wavelength of $500 \ m$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module