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

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(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

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Energy

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(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?

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