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Cut-off Wavelength

The minimum w...

Question

The minimum wavelength of X-rays produced in a Coolidge tube operated at potential difference of 40 kV is

A

0.31 \circ A

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B

3.1 \circ A

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C

31 \circ A

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D

311 \circ A

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Solution

The correct option is A $0.31 \circ A$
$λ_{m i n} = \frac{12375}{40 \times 10^{3}} = 0.309 \circ A \approx 0.31 \circ A$

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