Dual Nature Of Light Question 261
Question: If the work function for a certain metal is $ 3.2\times {{10}^{-19}} $ joule and it is illuminated with light of frequency $ 8\times 10^{14} $ Hz. The maximum kinetic energy of the photo-electrons would be [MP PET 1993]
Options:
A) $ 2.1\times {{10}^{-19}}J $
B) $ 8.5\times {{10}^{-19}}J $
C) $ 5.3\times {{10}^{-19}}J $
D) $ 3.2\times {{10}^{-19}}J $ $ (h=6.63\times {{10}^{-34}}Js) $
Show Answer
Answer:
Correct Answer: A
Solution:
$ {K_{\max }}=h\nu -W_{0} $ $ =6.6\times {{10}^{-34}}\times 8\times 10^{14}-3.2\times {{10}^{-19}} $ $ =2.1\times {{10}^{-19}}J $
BETA
