In Doppler effect change in frequency depends ona)distance between source and listenerb)speeds of source and listenerc)density of aird)half of distance between source and listenerCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

The reason for the Doppler effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave.

Answer

According to phenomenon of doppler effect , the apparent change in frequency of sound due to relative motion between sound and the observer. that is wavelength=velocity÷number of waves here freqency directly proportional to velocity that is speed

Answer

Understanding the Doppler Effect
The Doppler effect is a phenomenon observed when there is a relative motion between a source of sound (or light) and an observer. It results in a change in frequency (and wavelength) of the waves perceived by the observer.
Key Factors Affecting Frequency Change
- Relative Speeds of Source and Listener:
The most significant factor affecting the frequency change in the Doppler effect is the relative speed between the source of sound and the listener. When the source moves towards the listener, the waves get compressed, leading to a higher frequency (or pitch). Conversely, if the source is moving away, the waves are stretched, resulting in a lower frequency.
- Distance Between Source and Listener:
While distance does play a role in the intensity of sound perceived, it does not directly affect the frequency change due to the Doppler effect. The change in frequency is primarily due to the motion of the source or observer.
- Density of Air:
Although the medium's properties, such as density, can influence the speed of sound, they do not directly affect the frequency change experienced in the Doppler effect. The effect is independent of the medium as long as the medium remains constant.
- Half of Distance Between Source and Listener:
This option is not relevant to the Doppler effect. The frequency change does not depend on specific distances but on the relative velocities of the source and listener.
Conclusion
In summary, the correct answer is option 'B' as the Doppler effect predominantly hinges on the speeds of the source and listener. Understanding this relationship is crucial for comprehending how sound waves behave in different scenarios.

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