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Electrons with energy 80 keV are incdent...

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

A

a contimuous X - rays spectrum (Bremasstrablung) with a miximum wavelength of `0.155Å`

B

a contimuous X - rays spectrum (Bremasstrablung) with all wavelength

C

the characteristic X - rays spectrum of tungsten`

D

a contimuous X - rays spectrum (Bremasstrablung) with a miximum wavelength of `0.155Å` and the characteristic X - rays spectrum of tungsten.

Text Solution

Verified by Experts

The correct Answer is:
D
KEY CONCEPT :
`lambda_(min) = (he)/(E )`
`:.lambda_(min) = (12400)/(80 xx 10^(3)) Å = 0.155 Å`
Energy of incident electrons is greater than the ionization energy of electron in `K- shell`, the `K- shell` electrons will be knocked off . Hence, characteristic X - ray spectrum will be obtained
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