The number of photons falling per second on a completely darkened plate to produce a force of 
is 
. If the wavelength of the light falling is 
, then 
. 
Text Solution
Verified by ExpertsThe correct answer is:
B
If 
is the wavelength of the light falling, then momentum of each photon
(where 
is the Planck's constant)
As 
photons falling per second on the plate, the total momentum of all the photons falling per second on the plate
Since the plate is completely darkened, all the photons absorbed by it.
Rate of change of momentum of photons is
By Newton's second law, force on the plate is
or 
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