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Q.

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

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a

Twice that of A

b

Half of that of A

c

four times that of A

d

One fourth of that of A

answer is C.

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Detailed Solution

λ=hmV; Given  VA=VB;  Thus mAλA=mBλB; since h is a constant.              4×λA=1×λB
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