Q.

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 :

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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-

answer is D.

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Detailed Solution

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