Question

The amplitude on an electromagnetic wave in vacuum is doubled with not other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is correct ?

• A. The speed of wave propagation changes only
• B. The frequency of the wave changes only
• C. The wavelength of the wave changes only
• D. None of these.

Answer 1

Answer: (D)

None of these.

Answer 2

: Velocity of electromagnetic wave,

$c = \frac{1}{\sqrt{\mu_{0}\varepsilon_{0}}} = 3 \times 10^{8}ms^{- 1}$

It is independent of amplitude, frequency and wavelength of electromagnetic wave.