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A particle is travelling 4 times as fast as an electron . Assuming the ratio of  de-broglie wavelength of a particle to that of electron is 2:1, the mass of the particle is :

a
16 times the mass of e-
b
116 times the mass of e-
c
8 times the mass of e-
d
18 times the mass of e-

detailed solution

Correct option is D

λ=hp=hmv ⇒λpλe=memp×vevp   ⇒21= memp×14 ⇒mp=18me

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