Doppler Effect
PHXI15:WAVES

354749 Consider two sound sources \(S_{1}\) and \(S_{2}\) having same frequency \(100\;Hz\) and the observer \(O\) located between them. All the three are moving with same velocity in same direction. The beat frequency as heard by the observer is
supporting img

1 Zero
2 2
3 3
4 4
PHXI15:WAVES

354750 The observer is moving with velocity ' \(v_{0}\) ' towards the stationary source of sound and then after crossing moves away from the source with velocity \(v_{0}\). Assume that the medium through which the sound wave travel is at rest. If \(v\) is velocity of sound and \(n\) is the frequency emitted by the source, then the difference between apparent frequencies heard by the observer is

1 \(\dfrac{2 n v_{0}}{v}\)
2 \(\dfrac{n v_{0}}{v}\)
3 \(\dfrac{v}{2 n v_{0}}\)
4 \(\dfrac{v}{n v_{0}}\)
PHXI15:WAVES

354751 An observer is moving away from a source at rest. The pitch of the note heard by the observer is less because

1 The pitch of the source decreases
2 The velocity of sound in air increases
3 Wavelength of the wave becomes small
4 Wavelength of the wave remains unchanged but observer receives less number of waves
PHXI15:WAVES

354752 With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (\(v\) is velocity of sound).

1 \(2v\)
2 \(v\)
3 \(v / 2\)
4 \(3v\)
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PHXI15:WAVES

354749 Consider two sound sources \(S_{1}\) and \(S_{2}\) having same frequency \(100\;Hz\) and the observer \(O\) located between them. All the three are moving with same velocity in same direction. The beat frequency as heard by the observer is
supporting img

1 Zero
2 2
3 3
4 4
PHXI15:WAVES

354750 The observer is moving with velocity ' \(v_{0}\) ' towards the stationary source of sound and then after crossing moves away from the source with velocity \(v_{0}\). Assume that the medium through which the sound wave travel is at rest. If \(v\) is velocity of sound and \(n\) is the frequency emitted by the source, then the difference between apparent frequencies heard by the observer is

1 \(\dfrac{2 n v_{0}}{v}\)
2 \(\dfrac{n v_{0}}{v}\)
3 \(\dfrac{v}{2 n v_{0}}\)
4 \(\dfrac{v}{n v_{0}}\)
PHXI15:WAVES

354751 An observer is moving away from a source at rest. The pitch of the note heard by the observer is less because

1 The pitch of the source decreases
2 The velocity of sound in air increases
3 Wavelength of the wave becomes small
4 Wavelength of the wave remains unchanged but observer receives less number of waves
PHXI15:WAVES

354752 With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (\(v\) is velocity of sound).

1 \(2v\)
2 \(v\)
3 \(v / 2\)
4 \(3v\)
PHXI15:WAVES

354749 Consider two sound sources \(S_{1}\) and \(S_{2}\) having same frequency \(100\;Hz\) and the observer \(O\) located between them. All the three are moving with same velocity in same direction. The beat frequency as heard by the observer is
supporting img

1 Zero
2 2
3 3
4 4
PHXI15:WAVES

354750 The observer is moving with velocity ' \(v_{0}\) ' towards the stationary source of sound and then after crossing moves away from the source with velocity \(v_{0}\). Assume that the medium through which the sound wave travel is at rest. If \(v\) is velocity of sound and \(n\) is the frequency emitted by the source, then the difference between apparent frequencies heard by the observer is

1 \(\dfrac{2 n v_{0}}{v}\)
2 \(\dfrac{n v_{0}}{v}\)
3 \(\dfrac{v}{2 n v_{0}}\)
4 \(\dfrac{v}{n v_{0}}\)
PHXI15:WAVES

354751 An observer is moving away from a source at rest. The pitch of the note heard by the observer is less because

1 The pitch of the source decreases
2 The velocity of sound in air increases
3 Wavelength of the wave becomes small
4 Wavelength of the wave remains unchanged but observer receives less number of waves
PHXI15:WAVES

354752 With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (\(v\) is velocity of sound).

1 \(2v\)
2 \(v\)
3 \(v / 2\)
4 \(3v\)
PHXI15:WAVES

354749 Consider two sound sources \(S_{1}\) and \(S_{2}\) having same frequency \(100\;Hz\) and the observer \(O\) located between them. All the three are moving with same velocity in same direction. The beat frequency as heard by the observer is
supporting img

1 Zero
2 2
3 3
4 4
PHXI15:WAVES

354750 The observer is moving with velocity ' \(v_{0}\) ' towards the stationary source of sound and then after crossing moves away from the source with velocity \(v_{0}\). Assume that the medium through which the sound wave travel is at rest. If \(v\) is velocity of sound and \(n\) is the frequency emitted by the source, then the difference between apparent frequencies heard by the observer is

1 \(\dfrac{2 n v_{0}}{v}\)
2 \(\dfrac{n v_{0}}{v}\)
3 \(\dfrac{v}{2 n v_{0}}\)
4 \(\dfrac{v}{n v_{0}}\)
PHXI15:WAVES

354751 An observer is moving away from a source at rest. The pitch of the note heard by the observer is less because

1 The pitch of the source decreases
2 The velocity of sound in air increases
3 Wavelength of the wave becomes small
4 Wavelength of the wave remains unchanged but observer receives less number of waves
PHXI15:WAVES

354752 With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (\(v\) is velocity of sound).

1 \(2v\)
2 \(v\)
3 \(v / 2\)
4 \(3v\)