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Electrons with energy 80 keV are inciden...

Electrons with energy `80 keV` are incident on the tungsten target of an X - rays tube , k- shell electrons of tungsten have `72.5 keV` energy X- rays emitted by the tube contain only

A

a continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of 0.155 `overerset(@)(A)`

B

a continuous X-ray spectrum (Bremsstrahlung) with all wavelengths.

C

a continuous X-ray spectrum of tungsten.

D

a continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of 0.155 `overset(@)(A)` and the characteristic X-ray spectrum of tungsten.

Text Solution

Verified by Experts

The correct Answer is:
D
As `lambda_(0)=(hc)/E=1.554 times 10^(-11)m`
`therefore lambda_(0)=1.55 overset(@)(A)`
Which is the minimum wavelength of continuous X-rays which carry energy equivalent to energy of incident electrons. Now, as the energy of incident radiation is more than that of K-shell electrons, the characteristic X-rays appear as peaks on the continuous spectrum.
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