Which phenomenon explains the change in frequency of a wave in relation to the o

Which phenomenon explains the change in frequency of a wave in relation to the observer's motion?

Which phenomenon explains the change in frequency of a wave in relation to the observer's motion?

Step 1: Understand that waves can be sound waves, light waves, or any type of wave.
Step 2: Know that frequency is how often a wave occurs in a certain time period.
Step 3: Recognize that the observer is the person or device detecting the wave.
Step 4: Learn that the motion of the observer can change how they perceive the frequency of the wave.
Step 5: Identify that when the observer moves towards the wave source, the frequency appears higher.
Step 6: Understand that when the observer moves away from the wave source, the frequency appears lower.
Step 7: Conclude that this change in frequency due to motion is called the Doppler effect.

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