Doppler effect is applicable for a) sound waves only b) light waves only c) both sound and light waves d) None of these

Options

A. sound waves only
B. light waves only
C. both sound and light waves
D. None of these

Explanation

To solve the question regarding the applicability of the Doppler effect, we will follow these steps:

### Step 1: Understand the Doppler Effect
The Doppler effect refers to the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect can be observed when either the source of the wave is moving, the observer is moving, or both are in motion.

### Step 2: Identify the Types of Waves
The question asks about the applicability of the Doppler effect to different types of waves. We need to consider:
- Sound waves: These are mechanical waves that require a medium to travel through.
- Light waves: These are electromagnetic waves that can travel through a vacuum.

### Step 3: Analyze the Applicability of the Doppler Effect
The Doppler effect is not limited to just one type of wave. It is applicable to:
- Sound waves: When a sound source moves towards or away from an observer, the frequency of the sound perceived by the observer changes.
- Light waves: Similarly, when a light source moves relative to an observer, the frequency (or color) of the light observed changes, which is known as redshift or blueshift in astronomy.

### Step 4: Choose the Correct Option
Given that the Doppler effect applies to both sound and light waves, we can conclude that the correct answer to the question is option (c) both sound and light waves.

### Final Answer
The correct option is **c) both sound and light waves**.

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