Dual Nature Of Light Question 531
Question: The wavelength of $ {K_{\alpha }} $ line in copper is 1.54 Å. The ionisation energy of K electron in copper in Joule is [EAMCET 1984]
Options:
A) $ 11.2\times {{10}^{-27}} $
B) $ 12.9\times {{10}^{-16}} $
C) $ 1.7\times {{10}^{-15}} $
D) $ 10\times {{10}^{-16}} $
Show Answer
Answer:
Correct Answer: B
Solution:
Required ionisation energy $ =\frac{hc}{\lambda }=\frac{6.6\times {{10}^{-34}}\times 3\times 10^{8}}{1.54\times {{10}^{-10}}} $ J $ =12.9\times {{10}^{-16}} $ J
BETA
