What is the Doppler effect?

Problem Statement

What is the Doppler effect?

Step-by-Step Explanation

The Doppler effect is the observed change in frequency when a source and observer move relative to each other.

1. Identify what the question is asking. In Waves and Optics, this usually means naming the known quantities, the unknown quantity, and the concept that connects them.
2. Write the relevant definition, rule, or relationship before substituting numbers or manipulating symbols.
3. Work one step at a time and keep units, signs, and restrictions visible.
4. Check whether the answer makes sense in the original context.

Final Answer

The Doppler effect is the observed change in frequency when a source and observer move relative to each other. The reliable strategy is to start from the definition, apply the correct rule carefully, and then interpret the result in plain language.