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Question: An electron has velocity x ms<sup>–1</sup>. For a proton to have the same de-Broglie wavelength, the...

An electron has velocity x ms–1. For a proton to have the same de-Broglie wavelength, the velocity will be approximately –

A

1840x\frac{1840}{x}

B

x1840\frac{x}{1840}

C

1840x

D

x

Answer

x1840\frac{x}{1840}

Explanation

Solution

le = hmv\frac{h}{mv}= hme×x\frac{h}{m_{e} \times x}. . . (1)

lp = hmv\frac{h}{mv}= hmp×v\frac{h}{m_{p} \times v}

= h1840me×v\frac{h}{1840m_{e} \times v} . . . (2)

le = lp (given)

Ž hme×x\frac{h}{m_{e} \times x}= h1840me×v\frac{h}{1840m_{e} \times v}

Ž v = x1840\frac{x}{1840}