Doppler Effect
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PHXI15:WAVES

354723 A band playing music at frequency \(f\) is moving towards a wall at a speed \(v_{b}\). A motorist is following the band with a speed \(v_{m}\). If \(v\) be the speed of the sound, the expression for beat frequency heard by motorist is

1 \(\dfrac{v+v_{m}}{v-v_{b}} f\)
2 \(\dfrac{v+v_{m}}{v+v_{b}} f\)
3 \(\dfrac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f\)
4 \(\dfrac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f\)
PHXI15:WAVES

354724 A source of sound \(S\) is moving with a velocity of \(50\;m{s^{ - 1}}\) towards a stationary observer. The observer measures the frequency of the source as \(1000\;Hz\). What will be the apparent frequency of the sound has heard by observer when the source is moving away from the observer after crossing him? (the velocity of the sound in the medium is \(350\;m{s^{ - 1}}\) ).

1 \(750\;Hz\)
2 \(857\;Hz\)
3 \(1143\;Hz\)
4 \(1333\;Hz\)
AIIMS - 2011
PHXI15:WAVES

354725 Velocity of sound is \(v\). Source and observer move towards each other with velocities \(v_{s}\) and \(v_{0}\) respectively. Wind is blowing with a velocity \(v_{m}\) in the direction opposite to the propagation of sound; \(n\) is the pitch of the sound. The apparent pitch of the sound heard by the observer is

1 \(\left(\dfrac{v+v_{m}+v_{0}}{v+v_{m}+v_{s}}\right) n\)
2 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}+v_{s}}\right) n\)
3 \(\left(\dfrac{v+v_{m}-v_{0}}{v-v_{m}+v_{s}}\right) n\)
4 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}-v_{s}}\right) n\)
PHXI15:WAVES

354726 A source of sound moves away with velocity of sound from a stationary observer. Then the frequency of sound heard by the observer

1 Remains same
2 Is doubled
3 Is halved
4 Becomes infinity
PHXI15:WAVES

354727 When source of sound moves towards a stationary observer, the wavelength of sound received by him

1 Decreases while frequency increases
2 Remains the same, whereas frequency increases
3 Increase and frequency also increase
4 Decreases while frequency remains the same
MHTCET - 2018
NEET DIGITAL LIBRARY
PHXI15:WAVES

354723 A band playing music at frequency \(f\) is moving towards a wall at a speed \(v_{b}\). A motorist is following the band with a speed \(v_{m}\). If \(v\) be the speed of the sound, the expression for beat frequency heard by motorist is

1 \(\dfrac{v+v_{m}}{v-v_{b}} f\)
2 \(\dfrac{v+v_{m}}{v+v_{b}} f\)
3 \(\dfrac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f\)
4 \(\dfrac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f\)
PHXI15:WAVES

354724 A source of sound \(S\) is moving with a velocity of \(50\;m{s^{ - 1}}\) towards a stationary observer. The observer measures the frequency of the source as \(1000\;Hz\). What will be the apparent frequency of the sound has heard by observer when the source is moving away from the observer after crossing him? (the velocity of the sound in the medium is \(350\;m{s^{ - 1}}\) ).

1 \(750\;Hz\)
2 \(857\;Hz\)
3 \(1143\;Hz\)
4 \(1333\;Hz\)
AIIMS - 2011
PHXI15:WAVES

354725 Velocity of sound is \(v\). Source and observer move towards each other with velocities \(v_{s}\) and \(v_{0}\) respectively. Wind is blowing with a velocity \(v_{m}\) in the direction opposite to the propagation of sound; \(n\) is the pitch of the sound. The apparent pitch of the sound heard by the observer is

1 \(\left(\dfrac{v+v_{m}+v_{0}}{v+v_{m}+v_{s}}\right) n\)
2 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}+v_{s}}\right) n\)
3 \(\left(\dfrac{v+v_{m}-v_{0}}{v-v_{m}+v_{s}}\right) n\)
4 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}-v_{s}}\right) n\)
PHXI15:WAVES

354726 A source of sound moves away with velocity of sound from a stationary observer. Then the frequency of sound heard by the observer

1 Remains same
2 Is doubled
3 Is halved
4 Becomes infinity
PHXI15:WAVES

354727 When source of sound moves towards a stationary observer, the wavelength of sound received by him

1 Decreases while frequency increases
2 Remains the same, whereas frequency increases
3 Increase and frequency also increase
4 Decreases while frequency remains the same
MHTCET - 2018
Join With Us for More Updates
PHXI15:WAVES

354723 A band playing music at frequency \(f\) is moving towards a wall at a speed \(v_{b}\). A motorist is following the band with a speed \(v_{m}\). If \(v\) be the speed of the sound, the expression for beat frequency heard by motorist is

1 \(\dfrac{v+v_{m}}{v-v_{b}} f\)
2 \(\dfrac{v+v_{m}}{v+v_{b}} f\)
3 \(\dfrac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f\)
4 \(\dfrac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f\)
PHXI15:WAVES

354724 A source of sound \(S\) is moving with a velocity of \(50\;m{s^{ - 1}}\) towards a stationary observer. The observer measures the frequency of the source as \(1000\;Hz\). What will be the apparent frequency of the sound has heard by observer when the source is moving away from the observer after crossing him? (the velocity of the sound in the medium is \(350\;m{s^{ - 1}}\) ).

1 \(750\;Hz\)
2 \(857\;Hz\)
3 \(1143\;Hz\)
4 \(1333\;Hz\)
AIIMS - 2011
PHXI15:WAVES

354725 Velocity of sound is \(v\). Source and observer move towards each other with velocities \(v_{s}\) and \(v_{0}\) respectively. Wind is blowing with a velocity \(v_{m}\) in the direction opposite to the propagation of sound; \(n\) is the pitch of the sound. The apparent pitch of the sound heard by the observer is

1 \(\left(\dfrac{v+v_{m}+v_{0}}{v+v_{m}+v_{s}}\right) n\)
2 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}+v_{s}}\right) n\)
3 \(\left(\dfrac{v+v_{m}-v_{0}}{v-v_{m}+v_{s}}\right) n\)
4 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}-v_{s}}\right) n\)
PHXI15:WAVES

354726 A source of sound moves away with velocity of sound from a stationary observer. Then the frequency of sound heard by the observer

1 Remains same
2 Is doubled
3 Is halved
4 Becomes infinity
PHXI15:WAVES

354727 When source of sound moves towards a stationary observer, the wavelength of sound received by him

1 Decreases while frequency increases
2 Remains the same, whereas frequency increases
3 Increase and frequency also increase
4 Decreases while frequency remains the same
MHTCET - 2018
For More Updates join with Us
PHXI15:WAVES

354723 A band playing music at frequency \(f\) is moving towards a wall at a speed \(v_{b}\). A motorist is following the band with a speed \(v_{m}\). If \(v\) be the speed of the sound, the expression for beat frequency heard by motorist is

1 \(\dfrac{v+v_{m}}{v-v_{b}} f\)
2 \(\dfrac{v+v_{m}}{v+v_{b}} f\)
3 \(\dfrac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f\)
4 \(\dfrac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f\)
PHXI15:WAVES

354724 A source of sound \(S\) is moving with a velocity of \(50\;m{s^{ - 1}}\) towards a stationary observer. The observer measures the frequency of the source as \(1000\;Hz\). What will be the apparent frequency of the sound has heard by observer when the source is moving away from the observer after crossing him? (the velocity of the sound in the medium is \(350\;m{s^{ - 1}}\) ).

1 \(750\;Hz\)
2 \(857\;Hz\)
3 \(1143\;Hz\)
4 \(1333\;Hz\)
AIIMS - 2011
PHXI15:WAVES

354725 Velocity of sound is \(v\). Source and observer move towards each other with velocities \(v_{s}\) and \(v_{0}\) respectively. Wind is blowing with a velocity \(v_{m}\) in the direction opposite to the propagation of sound; \(n\) is the pitch of the sound. The apparent pitch of the sound heard by the observer is

1 \(\left(\dfrac{v+v_{m}+v_{0}}{v+v_{m}+v_{s}}\right) n\)
2 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}+v_{s}}\right) n\)
3 \(\left(\dfrac{v+v_{m}-v_{0}}{v-v_{m}+v_{s}}\right) n\)
4 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}-v_{s}}\right) n\)
PHXI15:WAVES

354726 A source of sound moves away with velocity of sound from a stationary observer. Then the frequency of sound heard by the observer

1 Remains same
2 Is doubled
3 Is halved
4 Becomes infinity
PHXI15:WAVES

354727 When source of sound moves towards a stationary observer, the wavelength of sound received by him

1 Decreases while frequency increases
2 Remains the same, whereas frequency increases
3 Increase and frequency also increase
4 Decreases while frequency remains the same
MHTCET - 2018
NEET DIGITAL LIBRARY
PHXI15:WAVES

354723 A band playing music at frequency \(f\) is moving towards a wall at a speed \(v_{b}\). A motorist is following the band with a speed \(v_{m}\). If \(v\) be the speed of the sound, the expression for beat frequency heard by motorist is

1 \(\dfrac{v+v_{m}}{v-v_{b}} f\)
2 \(\dfrac{v+v_{m}}{v+v_{b}} f\)
3 \(\dfrac{2 v_{b}\left(v+v_{m}\right)}{v^{2}-v_{b}^{2}} f\)
4 \(\dfrac{2 v_{m}\left(v+v_{b}\right)}{v^{2}-v_{m}^{2}} f\)
PHXI15:WAVES

354724 A source of sound \(S\) is moving with a velocity of \(50\;m{s^{ - 1}}\) towards a stationary observer. The observer measures the frequency of the source as \(1000\;Hz\). What will be the apparent frequency of the sound has heard by observer when the source is moving away from the observer after crossing him? (the velocity of the sound in the medium is \(350\;m{s^{ - 1}}\) ).

1 \(750\;Hz\)
2 \(857\;Hz\)
3 \(1143\;Hz\)
4 \(1333\;Hz\)
AIIMS - 2011
PHXI15:WAVES

354725 Velocity of sound is \(v\). Source and observer move towards each other with velocities \(v_{s}\) and \(v_{0}\) respectively. Wind is blowing with a velocity \(v_{m}\) in the direction opposite to the propagation of sound; \(n\) is the pitch of the sound. The apparent pitch of the sound heard by the observer is

1 \(\left(\dfrac{v+v_{m}+v_{0}}{v+v_{m}+v_{s}}\right) n\)
2 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}+v_{s}}\right) n\)
3 \(\left(\dfrac{v+v_{m}-v_{0}}{v-v_{m}+v_{s}}\right) n\)
4 \(\left(\dfrac{v-v_{m}+v_{0}}{v-v_{m}-v_{s}}\right) n\)
PHXI15:WAVES

354726 A source of sound moves away with velocity of sound from a stationary observer. Then the frequency of sound heard by the observer

1 Remains same
2 Is doubled
3 Is halved
4 Becomes infinity
PHXI15:WAVES

354727 When source of sound moves towards a stationary observer, the wavelength of sound received by him

1 Decreases while frequency increases
2 Remains the same, whereas frequency increases
3 Increase and frequency also increase
4 Decreases while frequency remains the same
MHTCET - 2018