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Q.

The mass of an electron is 9.1x 10-31 kg and its velocity is 812 ms-1. Calculate its wavelength

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a

89.67 nm

b

8.967 nm

c

896.7 nm

d

0.8967 m

answer is C.

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Detailed Solution

λ=hmv=6.626×10-34Js9.1×10-31 kg812 ms-1=8967×10-10 m= 896.7 nm
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The mass of an electron is 9.1x 10-31 kg and its velocity is 812 ms-1. Calculate its wavelength