Dual Nature Of Light Question 258
Question: In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be [MP PET 1995]
Options:
A) 2 V
B) Less than 2 V
C) Zero
D) Greater than 2 V
Show Answer
Answer:
Correct Answer: D
Solution:
According to Einstein’s photoelectric equation $ E=W_{0}+{K_{\max }} $
$ \Rightarrow V_{0}=\frac{hc}{e},[ \frac{1}{\lambda }-\frac{1}{{\lambda_{0}}} ] $ Hence if l decreases $ V_{0} $ increases.
BETA
