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An X-ray tube operated at 30 kV emits a ...

An X-ray tube operated at 30 kV emits a continuous X-ray of short wavelength limit `lambda =0.414 Å`. The value of Planck's constant is

A

`6.62xx10^(-34) J-s`

B

`6.7xx10^(-34) J-s`

C

`6.6xx10^(-34) J-s`

D

`6.67xx10^(-31) J-s`

Text Solution

Verified by Experts

The correct Answer is:
A
`E=(hc)/lambda = qV`
`:. h=(lambda q V)/c`
`=(0.414xx10^(-10)xx1.6xx10^(-19) xx30xx10^(3))/(3xx10^(8))`
`=6.62 xx10^(-34) JS`
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