Dual Nature Of Light Question 397
Question: At t=0, light of intensity $ 10^{12} $ $ 10^{12}photons/s-m^{2} $ of energy 6eV per photon start falling on a plate with work function 2.5eV. If area of the plate is $ 2\times {{10}^{-4}}m^{2} $ and for every $ 10^{5} $ photos one photoelectron is emitted, charge on the plate at $ t=25s $ is
Options:
A) $ 8\times {{10}^{-15}}C $
B) $ 4\times {{10}^{-14}}C $
C) $ 12\times {{10}^{-14}}C $
D) $ 16\times {{10}^{-14}}C $
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Number of emitted electrons $ =\frac{10^{12}\times 2\times {{10}^{-4}}\times 25}{10^{5}}=5\times 10^{4}\text{ electrons} $ $ \text{q=+ne=}8\times {{10}^{-15}}C $
BETA
