Doppler Effect
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PHXI15:WAVES

354741 Two sound sources emitting sound each of wavelength \(\lambda\) are fixed at a given distance apart. A listener moves with a velocity \(u\) along the line joining the two sources. The number of beats heard by him per second is :

1 \(\dfrac{2 u}{\lambda}\)
2 \(\dfrac{u}{2 \lambda}\)
3 \(\dfrac{u}{3 \lambda}\)
4 \(\dfrac{u}{\lambda}\)
PHXI15:WAVES

354742 A detector away from the source of a wave is detecting pulses of that wave every 0.2 second. If the detector starts to move towards the sources at a speed of \(6.0\;km/h\), then it would detect a total of 18200 pulses per hour. What is the speed of the wave?

1 \(150\;m/s\)
2 \(300\;m/s\)
3 \(200\;m/s\)
4 \(100\;m/s\)
PHXI15:WAVES

354743 A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?

1 Velocity of sound
2 Time period
3 Wavelength
4 Intensity
PHXI15:WAVES

354744 There are four possible relative motions between the source of a sound and the listener
(A) Source moves towards stationary listener
(B) Source moves away from stationary listener
(C) Listener moves towards stationary source
(D) Listener moves away from stationary source
In which of the cases, the change in frequency is same. The magnitude of velocity of source or listener being the same.

1 \(A\) and \(B\)
2 \(B\) and \(C\)
3 \(C\) and \(D\)
4 \(D\) and \(A\)
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PHXI15:WAVES

354741 Two sound sources emitting sound each of wavelength \(\lambda\) are fixed at a given distance apart. A listener moves with a velocity \(u\) along the line joining the two sources. The number of beats heard by him per second is :

1 \(\dfrac{2 u}{\lambda}\)
2 \(\dfrac{u}{2 \lambda}\)
3 \(\dfrac{u}{3 \lambda}\)
4 \(\dfrac{u}{\lambda}\)
PHXI15:WAVES

354742 A detector away from the source of a wave is detecting pulses of that wave every 0.2 second. If the detector starts to move towards the sources at a speed of \(6.0\;km/h\), then it would detect a total of 18200 pulses per hour. What is the speed of the wave?

1 \(150\;m/s\)
2 \(300\;m/s\)
3 \(200\;m/s\)
4 \(100\;m/s\)
PHXI15:WAVES

354743 A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?

1 Velocity of sound
2 Time period
3 Wavelength
4 Intensity
PHXI15:WAVES

354744 There are four possible relative motions between the source of a sound and the listener
(A) Source moves towards stationary listener
(B) Source moves away from stationary listener
(C) Listener moves towards stationary source
(D) Listener moves away from stationary source
In which of the cases, the change in frequency is same. The magnitude of velocity of source or listener being the same.

1 \(A\) and \(B\)
2 \(B\) and \(C\)
3 \(C\) and \(D\)
4 \(D\) and \(A\)
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PHXI15:WAVES

354741 Two sound sources emitting sound each of wavelength \(\lambda\) are fixed at a given distance apart. A listener moves with a velocity \(u\) along the line joining the two sources. The number of beats heard by him per second is :

1 \(\dfrac{2 u}{\lambda}\)
2 \(\dfrac{u}{2 \lambda}\)
3 \(\dfrac{u}{3 \lambda}\)
4 \(\dfrac{u}{\lambda}\)
PHXI15:WAVES

354742 A detector away from the source of a wave is detecting pulses of that wave every 0.2 second. If the detector starts to move towards the sources at a speed of \(6.0\;km/h\), then it would detect a total of 18200 pulses per hour. What is the speed of the wave?

1 \(150\;m/s\)
2 \(300\;m/s\)
3 \(200\;m/s\)
4 \(100\;m/s\)
PHXI15:WAVES

354743 A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?

1 Velocity of sound
2 Time period
3 Wavelength
4 Intensity
PHXI15:WAVES

354744 There are four possible relative motions between the source of a sound and the listener
(A) Source moves towards stationary listener
(B) Source moves away from stationary listener
(C) Listener moves towards stationary source
(D) Listener moves away from stationary source
In which of the cases, the change in frequency is same. The magnitude of velocity of source or listener being the same.

1 \(A\) and \(B\)
2 \(B\) and \(C\)
3 \(C\) and \(D\)
4 \(D\) and \(A\)
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PHXI15:WAVES

354741 Two sound sources emitting sound each of wavelength \(\lambda\) are fixed at a given distance apart. A listener moves with a velocity \(u\) along the line joining the two sources. The number of beats heard by him per second is :

1 \(\dfrac{2 u}{\lambda}\)
2 \(\dfrac{u}{2 \lambda}\)
3 \(\dfrac{u}{3 \lambda}\)
4 \(\dfrac{u}{\lambda}\)
PHXI15:WAVES

354742 A detector away from the source of a wave is detecting pulses of that wave every 0.2 second. If the detector starts to move towards the sources at a speed of \(6.0\;km/h\), then it would detect a total of 18200 pulses per hour. What is the speed of the wave?

1 \(150\;m/s\)
2 \(300\;m/s\)
3 \(200\;m/s\)
4 \(100\;m/s\)
PHXI15:WAVES

354743 A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?

1 Velocity of sound
2 Time period
3 Wavelength
4 Intensity
PHXI15:WAVES

354744 There are four possible relative motions between the source of a sound and the listener
(A) Source moves towards stationary listener
(B) Source moves away from stationary listener
(C) Listener moves towards stationary source
(D) Listener moves away from stationary source
In which of the cases, the change in frequency is same. The magnitude of velocity of source or listener being the same.

1 \(A\) and \(B\)
2 \(B\) and \(C\)
3 \(C\) and \(D\)
4 \(D\) and \(A\)