A parallel beam of light of wavelength 900 nm and intensity 100 Wm -2 is incident on a surface perpendicular to the beam. Tire number of photons crossing 1 cm 2 area perpendicular to the beam in one second is:
Text Solution
Verified by ExpertsThe correct answer is:
B
Wavelength of incident beam 
= 900 x 10 -9 m
Intensity of incident beam =I= 100 W/m 2
No. of photons crossing per unit sec
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