Q. The apparent change in frequency due to the relative motion between a source and an observer is called the __________ effect.

किसी स्रोत और पर्यवेक्षक के बीच सापेक्ष गति के कारण आवृत्ति में स्पष्ट परिवर्तन को __________ प्रभाव कहा जाता है।

A
Doppler
डॉपलर
B
Bernoulli
बरनौली
C
Huygens
हुय्गेंस
D
Photoelectric
फोटो इलेक्ट्रिक

Explanation

The Doppler Effect describes the change in frequency or pitch of a wave perceived by an observer due to motion of the source or observer.
Approaching → higher frequency, moving away → lower frequency.
Common in ambulance sirens.

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