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Waves question

2011 · Shift 1 · Q54
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Waves question

2011 · Shift 1 · Q54

JEE AdvancedPhysicsWavesMCQ+3 / −0.75
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is
  1. A
    8.50 kHz
  2. B
    8.25 kHz
  3. C
    7.75 kHz
  4. D
    7.50 kHz
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