Dual Nature Of Light Question 364
Question: A 5 watt source emits monochromatic light of wavelength $ \text{5000 }\overset{o}{\mathop{A}}, $ . 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
Options:
A) 8
B) 16
C) 2
D) 4
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Number of emitted electrons $ N_{E}\propto Intensity\propto \frac{1}{( Distance )} $ Therefore, as distance is doubled, $ N_{E} $ decreases by (1/4) times.
BETA
