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Two matter waves A and B have same  magnitude of wavelength. If mass of B is four times that of A then the velocity of A must be …… 

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a
Twice that of B
b
Half of that of B
c
Four times that of B
d
One fourth of that of B
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detailed solution

Correct option is C

λ=hmv; Given  λA=λB;  Thus mAvA=mBvB; since h is a constant.              1×vA=4×vB


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