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Calculate the cut-off wavelength and cut...

Calculate the cut-off wavelength and cutoff frequency of x-rays from an x-ray tube of accelerating potential 20,000 V.

Text Solution

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The cut-off wavelength of the characteristic x-rays is
`lambda_(0) = (12400)/(V) Å = (12400)/(20000) Å = 0.62 Å`
The corresponding frequency is
`V_(0) = (c)/(lambda_(0)) = (3 xx 10^(8))/(0.62 xx 10^(-10)) = 4.84 xx 10^(18)` Hz
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