Q. What is the phenomenon where the frequency of a wave appears to change as its source moves relative to an observer?
वह कौन सी घटना है जहां किसी तरंग की आवृत्ति तब बदलती हुई प्रतीत होती है जब उसका स्रोत पर्यवेक्षक के सापेक्ष गति करता है?
Explanation
The Doppler Effect refers to the apparent change in frequency of a wave when the source and observer are moving relative to each other.
Example: The pitch of a siren changes as an ambulance passes by.
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