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The energy that should be added to an el...

The energy that should be added to an electron, to reduce its de-Broglie wavelengths from `10^(-10) m` to `0.5 xx 10^(-10)` m wil be

A

150 eV

B

300 eV

C

450 eV

D

6000 eV

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda_1=1Å rArr V_1=150/1^2 `=150 v
`lambda_2=1/2Å rArr V_2 = 150/(1/2)^2`=600 V
`kE_2` = 600eV
`DeltaK=KE_2-KE_1`
=600-150=450 eV
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