Dual Nature Of Light Question 128
Question: If the de-Broglie wavelengths for a proton and for a $ \alpha - $ particle are equal, then the ratio of their velocities will be [NCERT 1972]
Options:
A) 4 : 1
B) 2 : 1
C) 1 : 2
D) 1 : 4
Show Answer
Answer:
Correct Answer: A
Solution:
$ \lambda =\frac{h}{m_{1}v_{1}}=\frac{h}{m_{2}v_{2}};\ \ \therefore \ \ \frac{v_{1}}{v_{2}}=\frac{m_{2}}{m_{1}}=\frac{4}{1} $
BETA
