Photon is quantum of radiation with energy 
, where 
is frequency and 
is Planck's
constant. The dimensions of 
are the same as that of:
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(b, d) We know that energy of radiation, 
,
As we know that linear impulse, 
Dimension of linear impulse 
Dimensions of momentum 
Angular impulse 
Change in angular momentum
Hence, dimension of angular impulse
Dimension of angular momentum
.
This is similar to the dimensions of Planck's constant 
.
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