An electron of mass me and a proton of mass mp are moving with the same speed. T

Question

An electron of mass m_e and a proton of mass

m_{p}

are moving with the same speed. The ratio of their de-Brogile wave length

(\frac{λ_{e}}{λ_{p}})

Options:

A . 981

B . 11836

C . 1836

D . 1381

Answer: Option C
:
C

(\frac{λ_{e}}{λ_{p}}) = \frac{h}{m_{e} V} \times \frac{m_{p} V}{h} = \frac{m_{p}}{m_{e}} = \frac{1.67 \times 10^{- 27}}{9.1 \times 10^{- 31}} = 1836

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