Question
Physics Question on Dual nature of matter
A 5 watt source emits monochromatic light of wavelength 5000?. When placed 0.5m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photo electrons liberated will:
A
be reduced by a factor of 8
B
be reduced by a factor of 16
C
be reduced by a factor of 2
D
be reduced by a factor of 4
Answer
be reduced by a factor of 4
Explanation
Solution
No. of photoelectrons or intensity ∝( distance )21