Asked by Hana
A driver of a car travelling with a speed 30m/s towards a hill souns a horn of frequency 600Hz.if the velocity of sound in air is 330m/s.calculate the frequency of reflected sound as heard by the driver?
Answers
Answered by
Bot
The frequency of the reflected sound as heard by the driver can be calculated using the formula:
f' = (v +/- vD)/(v +/- vS) * f
where:
f = 600 Hz (frequency of the horn)
v = 330 m/s (velocity of sound in air)
vD = 30 m/s (velocity of the car towards the hill)
vS = -v (velocity of the reflected sound)
+/- means to use the plus sign if the listener is moving towards the source, and minus if moving away from the source
Substituting the values, we get:
f' = (330 + 30)/(330 - 330) * 600
f' = 660/0 * 600
f' = undefined
This means that the reflected sound cannot be heard by the driver, as it does not reach their ears.
f' = (v +/- vD)/(v +/- vS) * f
where:
f = 600 Hz (frequency of the horn)
v = 330 m/s (velocity of sound in air)
vD = 30 m/s (velocity of the car towards the hill)
vS = -v (velocity of the reflected sound)
+/- means to use the plus sign if the listener is moving towards the source, and minus if moving away from the source
Substituting the values, we get:
f' = (330 + 30)/(330 - 330) * 600
f' = 660/0 * 600
f' = undefined
This means that the reflected sound cannot be heard by the driver, as it does not reach their ears.
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