First slide

Nature of electromagnetic wave

Question

The frequency of e.m. wave which is best suited to observe a particle of radius $3 \times 10^{- 4} cm$ , is of the order of

Moderate

A

$10^{15} Hz$
B

$10^{14} Hz$
C

$10^{13} Hz$
D

$10^{12} Hz$

Solution

Radius of particle is $λ .$
$∴ v = \frac{c}{λ} = \frac{3 \times 10^{8}}{6 \times 10^{- 6}} = 5 \times 10^{13} Hz . S o t h e o r d e r o f m a g n i t u d e i s 10^{14}$
For observation of particle, the wave frequency should be more than 10¹⁴ Hz, or wavelength should be smaller.

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