The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at 18.0 km/h? Speed of sound in air = 340 m/s.

2436 Hz

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2400 Hz

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2374 Hz

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None of these

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Solution

The correct option is A
2436 Hz

$f = \frac{v + u_{0}}{v - u_{s}} f_{0}$ [18km/h=5m/s]

app. Frequency= $(\frac{340 + 0}{340 - 5}) \times 2400 = 2436 H z$

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The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at 18.0 km/h? Speed of sound in air = 340 m/s.

The correct option is A 2436 Hz f=v+u0v−usf0 [18km/h=5m/s] app. Frequency=(340+0340−5)×2400=2436Hz

The correct option is A
2436 Hz

$f = \frac{v + u_{0}}{v - u_{s}} f_{0}$ [18km/h=5m/s]

app. Frequency= $(\frac{340 + 0}{340 - 5}) \times 2400 = 2436 H z$