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The mass of an electron is 9.1 xx 10^...

The mass of an electron is `9.1 xx 10^(31) kg` if its K.E. Is `3.0 xx 10^(25) J` calculate its wavelength .

A

0.243 `"Å"`

B

0.0243 `"Å"`

C

4.21 `"Å"`

D

0.421 `"Å"`

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda=(h)/(mv)=(6.62xx10^(-34))/(9.1xx10^(-31)xx2.99xx10^(-8))`
0.024 `"Å"`
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