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Question

Calculate the wavelength of an electron if it is travelling at a speed of 1.6×108 ms1.

Mass of an electron =9.1×1031 kg

A
4.5×1011 m
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B
4.5×1012 m
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C
4.5×1010 m
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D
4.5×1013 m
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Solution

The correct option is B 4.5×1012 m
Given:

v=1.6×108 ms1

The wavelength associated with an electron is given by,

λ=hp=hmv

λ=6.6×10349.1×1031×1.6×108

λ=4.5×1012 m

Hence, option (A) is the correct answer.

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