CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Apparent Frequency:Source Moving

A car moves a...

Question

A car moves at speed 15 $m / s$ towards the man and produces a sound of 480 $H z. T$ he man also starts running at a speed of 5 $m / s$ and approaches the car along the same road. What frequency does the man hear? (Velocity of sound = 345 $m / s$ )

A

509

H z

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

460

H z

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

430

H z

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

409

H z

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A 509 $H z$
$f_{a p p} = f_{o} {\frac{v + v_{L}}{v - v_{s}}}$
$= 480 {\frac{345 + 5}{345 - 15}} = 480 \times \frac{350}{330}$ = 509 $H z$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A car is moving at speed of 54

k m / h r

and produces a sound of frequency 630

H z

. A person running with a speed of

2 m / s

is approaching the car. What frequency would the person hear? (speed of sound =

330 m / s

)

Q. A police bike with its siren on, moving with a velocity

v_{s}

toward a man standing at a bus stop. As the bike approaches, the man hears the sound at a frequency of

f_{d}

. Take the speed of sound to be

v

.
Calculate the frequency produced by the siren?

Q. A police bike with its siren on, moving with a velocity

v_{s}

toward a man standing at a bus stop. As the bike approaches, the man hears the sound at a frequency of

f_{d}

. Take the speed of sound to be

v

.
Calculate the wavelength of the sound produced by the siren?

Q. A man see a car is traveling at speed 20 m/s away. If the car's horn emits a frequency of 600 Hz, what frequency will man hear? Assume v = 340 m/s for the speed of sound.

Q. A man is driving a car at a speed of 72 kmph towards a hill. He sounds the horn and hears its echo after 2 seconds. At what distance from the hill the horn was sounded. (Velocity of sound = 340 m/s)

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Doppler's Effect

PHYSICS

Watch in App

explore_more_icon

Explore more

Apparent Frequency:Source Moving

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon