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What is the approximate value of the de ...

What is the approximate value of the de broglie wavelength of an electron having 80 eV of electron ?
`(1eV = 1.6xx10^(-19) J " mass of electron " = 9xx10^(-31) kg, " Plank's constant " = 6.6xx10^(-34)` J-sec)

A

14 Å

B

1.4 Å

C

140 Å

D

0.14 Å

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda = (h)/(mv) = (h)/(sqrt(2mE))`
`= (6.6xx10^(-34))/(sqrt(2xx9xx10^(-31)xx80xx1.6xx10^(-19))`
`= (6.6xx10^(-34))/(10^(-25) sqrt(16xx144)) = (6.6xx10^(-9))/(48)`
`1.375xx10^(-10) = 1.4 Å`
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