Q.

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

answer is C.

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Detailed Solution

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