First slide

Introduction-Electromagnetic waves

Question

A photon of light enters a block of glass after travelling through vacuum. The energy of the photon on entering the glass block

Easy

A

Increases because its associated wavelength decreases
B

decreases because the speed of the radiation decreases
C

stays the same because the speed of the radiation and the associated wavelength do not change.
D

stays the same because the frequency of the radiation does not change

Solution

The frequency of light does not change with medium.
$f r o m e q u a t i o n E = h ϑ w e c a n s e e t h a t e n e r g y w i l l a l s o r e m a i n s a m e .$

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