Frequency Shifts: Doppler Effect & Wavelength

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SUMMARY

The discussion centers on the Doppler Effect, specifically how frequency and wavelength change relative to an observer when a sound source is in motion. When the sound source moves towards the observer, the wavelength decreases while the frequency increases, adhering to the equation Velocity = Wavelength * Frequency. Conversely, when the source moves away, the wavelength increases and the frequency decreases. This phenomenon is influenced by the velocity of sound in air, which remains constant regardless of the source's velocity.

PREREQUISITES
  • Understanding of the Doppler Effect
  • Basic knowledge of wave mechanics
  • Familiarity with the relationship between velocity, frequency, and wavelength
  • Awareness of factors affecting sound velocity in air
NEXT STEPS
  • Research the mathematical derivation of the Doppler Effect
  • Explore applications of the Doppler Effect in astronomy
  • Learn about sound wave propagation in different mediums
  • Investigate the impact of air density on sound velocity
USEFUL FOR

Students of physics, audio engineers, and anyone interested in wave behavior and sound dynamics.

BF3MW3
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Frequency changes relative to the observer due to the doppler effect. Does wavelength?
 
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BF3MW3 said:
Frequency changes relative to the observer due to the doppler effect. Does wavelength?

The velocity of the source is not the velocity of the sound wave that you hear coming from that source. The velocity of sound in air depends on the air density, etc., but not on the velocity of the source.

So now what do you think is the answer to your question?
 
the wave length becomes shorter ?
 
BF3MW3 said:
the wave length becomes shorter ?

When the sound source is moving towards you, yes. The sound velocity itself stays the same, and the wavelength shrinks and the frequency goes up:

Velocity = Wavelength * Frequency (check the units to be sure that I'm correct on this)

If the souce of the sound is moving away from you, what happens?

http://en.wikipedia.org/wiki/Doppler_effect

.
 

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