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Question

The electron beam in a colour TV is accelerated through 32 kV and then strikes the screen. What is the wavelength of the most energetic X-ray photon? (hc=1242 eV-nm)

A
38.8 pm
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B
48.8 pm
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C
58.8 pm
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D
68.8 pm
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Solution

The correct option is A 38.8 pm
Given, V=32 kV=32×103 V

When electron beam is accelerated through 32 kV, the energy supplied be

E=32×103 eV,

λ=hcE=1242 eV-nm32×103 eV

=38.8×103 nm=38.8 pm

Hence, (A) is the correct answer.
Why this question?
Caution: Be careful with the unit while substituting the values of hc and λ.

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