NEET 2007 Physics question
A 5 watt source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will
Answer: (2)
Solution
The number of photoelectrons emitted per second is proportional to the intensity of the incident light (for a given frequency above the threshold). Intensity from a point source varies inversely as the square of the distance: . When the
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