Doppler effect

When a sound source moves toward a stationary listener, what happens to the perceived pitch?
It decreases
It becomes silent
It increases
It remains the same
In the Doppler effect equation what does the variable V represent?
the volume of the sound
the speed of the sound source
the speed of the sound waves in the medium
the speed of the detector
If an ambulance is moving away from you, the sound waves reaching your ears are:
Compressed (Higher frequency)
Stretched (Lower frequency)
Moving faster than the speed of sound
Changing their actual source frequency
Which of the following scenarios would result in an increase in the detected frequency (Fd)?
The listener runs away from a stationary siren
The siren moves away from a stationary listener
The listener runs toward a stationary siren
Both the listener and the siren move away from each other
What happens to the frequency heard by an observer standing directly on a moving train whistle?
The frequency increases
The frequency decreases
The frequency remains the same as the source frequency (Fs)
The sound becomes a sonic boom
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