A `5 W` source emits monochromatic light of wavelength `5000 �`.
Channel: Doubtnut
Date: 2020-01-19

A `5 W` source emits monochromatic light of wavelength `5000 �`. 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 be reduced by a factor of