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A potential difference of 20 kV is appli...

A potential difference of 20 kV is applied across a Cu-anode X-ray tube. Given value of Planck's constant = `6.62 xx 10^(-34) J-s`. The minimum wavelength of continuous spectrum of photons generated will be :

A

`10^9 m`

B

`6.2 xx 10^(-11) m`

C

`1.32 nm`

D

`6.2 Å`

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