Dual Nature Of Light Question 90
Question: A photon of $ 1.7\times {{10}^{-13}} $ Joules is absorbed by a material under special circumstances. The correct statement is [MP PET 1999; JIPMER 2000]
Options:
A) Electrons of the atom of absorbed material will go the higher energy states
B) Electron and positron pair will be created
C) Only positron will be produced
D) Photoelectric effect will occur and electron will be produced
Show Answer
Answer:
Correct Answer: B
Solution:
For electron and positron pair production, minimum energy is 1.02 MeV. Energy of photon is given 1.7 ´ 10-3 J $ =\frac{1.7\times {{10}^{-13}}}{1.6\times {{10}^{-19}}} $ = 1.06 MeV. Since energy of photon is greater than 1.02 MeV, So electron, positron pair will be created.
BETA
