Question

The amplitude of an electromagnetic wave in vacuum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is correct?

• A. The frequency of the wave changes only
• B. The wave length of the wave changes only
• C. The speed of the wave propagation changes only
• D. Alone of the above is correct

Hint:

In electromagnetic waves, amplitude changes don't affect frequency, wavelength, or speed, as these properties are determined by other factors like medium and source properties.

Answer 1

The Correct Option is D

Step 1: Understanding the situation.
Doubling the amplitude of an electromagnetic wave doesn't affect the speed of propagation, wavelength, or frequency directly. The wave's characteristics, like frequency and speed, remain unchanged unless a different parameter such as energy is altered.

Step 2: Conclusion.
As the amplitude is doubled, but no changes are made to the wave’s other parameters, we conclude that none of the provided options are fully correct. Therefore, the answer is "Alone of the above is correct."