Doppler Effect
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WAVES

172939 A bus is moving with a velocity of $5 \mathrm{~m} / \mathrm{s}$ towards a wall. The driver blows the horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be

1 5
2 6
3 2
4 4
MHT-CET 2020
WAVES

172940 A source of sound is moving with constant velocity of $30 \mathrm{~m} / \mathrm{s}$ emitting a note of frequency $256 \mathrm{~Hz}$. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is speed of sound in air $=330 \mathrm{~m} / \mathrm{s}$

1 $6: 5$
2 $9: 8$
3 $5: 6$
4 $8: 9$
MHT-CET 2020
WAVES

172941 A car sounding a horn of frequency $1000 \mathrm{~Hz}$ passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is $11: 9$. If the speed of sound is ' $V$ ', the speed of the car is

1 $\mathrm{V}$
2 $\mathrm{V} / 10$
3 $\mathrm{V} / 5$
4 $\mathrm{V} / 100$
MHT-CET 2020
WAVES

172943 A source of sound is moving towards a stationary observer with velocity ' $V_{s}$ ' and then moves away with velocity ' $V_{s}$ '. Assume that the medium through which the sound waves travel is at rest, if ' $V$ ' is the velocity of sound and ' $n$ ' is the frequency emitted by the source, then the difference between the apparent frequencies heard by the observer is

1 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
2 $n V V_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
3 $n V_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
4 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
MHT-CET 2020
NEET DIGITAL LIBRARY
WAVES

172939 A bus is moving with a velocity of $5 \mathrm{~m} / \mathrm{s}$ towards a wall. The driver blows the horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be

1 5
2 6
3 2
4 4
MHT-CET 2020
WAVES

172940 A source of sound is moving with constant velocity of $30 \mathrm{~m} / \mathrm{s}$ emitting a note of frequency $256 \mathrm{~Hz}$. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is speed of sound in air $=330 \mathrm{~m} / \mathrm{s}$

1 $6: 5$
2 $9: 8$
3 $5: 6$
4 $8: 9$
MHT-CET 2020
WAVES

172941 A car sounding a horn of frequency $1000 \mathrm{~Hz}$ passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is $11: 9$. If the speed of sound is ' $V$ ', the speed of the car is

1 $\mathrm{V}$
2 $\mathrm{V} / 10$
3 $\mathrm{V} / 5$
4 $\mathrm{V} / 100$
MHT-CET 2020
WAVES

172943 A source of sound is moving towards a stationary observer with velocity ' $V_{s}$ ' and then moves away with velocity ' $V_{s}$ '. Assume that the medium through which the sound waves travel is at rest, if ' $V$ ' is the velocity of sound and ' $n$ ' is the frequency emitted by the source, then the difference between the apparent frequencies heard by the observer is

1 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
2 $n V V_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
3 $n V_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
4 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
MHT-CET 2020
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WAVES

172939 A bus is moving with a velocity of $5 \mathrm{~m} / \mathrm{s}$ towards a wall. The driver blows the horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be

1 5
2 6
3 2
4 4
MHT-CET 2020
WAVES

172940 A source of sound is moving with constant velocity of $30 \mathrm{~m} / \mathrm{s}$ emitting a note of frequency $256 \mathrm{~Hz}$. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is speed of sound in air $=330 \mathrm{~m} / \mathrm{s}$

1 $6: 5$
2 $9: 8$
3 $5: 6$
4 $8: 9$
MHT-CET 2020
WAVES

172941 A car sounding a horn of frequency $1000 \mathrm{~Hz}$ passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is $11: 9$. If the speed of sound is ' $V$ ', the speed of the car is

1 $\mathrm{V}$
2 $\mathrm{V} / 10$
3 $\mathrm{V} / 5$
4 $\mathrm{V} / 100$
MHT-CET 2020
WAVES

172943 A source of sound is moving towards a stationary observer with velocity ' $V_{s}$ ' and then moves away with velocity ' $V_{s}$ '. Assume that the medium through which the sound waves travel is at rest, if ' $V$ ' is the velocity of sound and ' $n$ ' is the frequency emitted by the source, then the difference between the apparent frequencies heard by the observer is

1 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
2 $n V V_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
3 $n V_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
4 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
MHT-CET 2020
For More Updates join with Us
WAVES

172939 A bus is moving with a velocity of $5 \mathrm{~m} / \mathrm{s}$ towards a wall. The driver blows the horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~m} / \mathrm{s}$, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be

1 5
2 6
3 2
4 4
MHT-CET 2020
WAVES

172940 A source of sound is moving with constant velocity of $30 \mathrm{~m} / \mathrm{s}$ emitting a note of frequency $256 \mathrm{~Hz}$. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is speed of sound in air $=330 \mathrm{~m} / \mathrm{s}$

1 $6: 5$
2 $9: 8$
3 $5: 6$
4 $8: 9$
MHT-CET 2020
WAVES

172941 A car sounding a horn of frequency $1000 \mathrm{~Hz}$ passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is $11: 9$. If the speed of sound is ' $V$ ', the speed of the car is

1 $\mathrm{V}$
2 $\mathrm{V} / 10$
3 $\mathrm{V} / 5$
4 $\mathrm{V} / 100$
MHT-CET 2020
WAVES

172943 A source of sound is moving towards a stationary observer with velocity ' $V_{s}$ ' and then moves away with velocity ' $V_{s}$ '. Assume that the medium through which the sound waves travel is at rest, if ' $V$ ' is the velocity of sound and ' $n$ ' is the frequency emitted by the source, then the difference between the apparent frequencies heard by the observer is

1 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
2 $n V V_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
3 $n V_{\mathrm{s}} /\left(\mathrm{V}_{\mathrm{s}}^{2}-\mathrm{V}^{2}\right)$
4 $2 \mathrm{nVV}_{\mathrm{s}} /\left(\mathrm{V}^{2}-\mathrm{V}_{\mathrm{s}}^{2}\right)$
MHT-CET 2020
NEET DIGITAL LIBRARY