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The wavelength associated with an electr...

The wavelength associated with an electron moving with a velocity of `10^8 "cm s"^(-1)` is

A

72.7 Å

B

7.27 Å

C

0.727 Å

D

0.277 Å

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda=h/"mv"=(6.6xx10^(-34))/(9.1xx10^(-31)xx10^8 xx 10^(-2))`
`=.725xx10^(-9)m =7.25xx10^(-10)m`
=7.25Å`~~`7.27Å
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