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Question

Choose the correct answer from the alternatives given.
The frequency of electromagnetic wave, which best suited to observe a particle of radii 3×104cm is of the order of:

A
1015
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B
1016
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C
1013
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D
1012
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Solution

The correct option is B 1013
Size of particle
=2×(3×104)=6×104cm6×106m

To observe a particle, the wavelength of electromagnetic waves must be of the size of the particle.
Hence, frequency of the wave is given by:
f=cλ

=3×1086×106=0.5×1014=5×1013 Hz

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