Em Waves Question 79
Question: Two electrons are moving with same speed v. One electron enters a region of uniform electric field while the other enters a region of uniform magnetic field, then after some time de Broglie wavelengths of two are $ {\lambda _{1}} $ and $ {\lambda _{2}} $ , respectively. Now,
Options:
A) $ {\lambda _{1}}={\lambda _{2}} $
B) $ {\lambda _{1}}>{\lambda _{2}} $
C) $ {\lambda _{1}}<{\lambda _{2}} $
D) $ {\lambda _{1}} $ can be greater than or less than $ {\lambda _{2}} $
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Answer:
Correct Answer: D
Solution:
[d] Speed of electron which enters into electric field may increase or decrease while for second electron, it remains constant. So, from $ \lambda =\frac{h}{mv’} $
$ {\lambda _{1}}>{\lambda _{2}} $ Or $ {\lambda _{1}}<{\lambda _{2}} $
BETA
