One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
25 pm
75 pm
50 pm
100 pm.
A
50 pm
B
100 pm.
C
25 pm
D
75 pm
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Solution
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The missing wavelength from the X-rays coming from the Coolidge tube is -
25×10−12m=25pm
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