Home
Class 11
PHYSICS
Two car moving in opposite directions ap...

Two car moving in opposite directions approach each other with speed of `22m//s` and `16.5m//s` respectively. The driver of the first car blows a horn having a frequency `400 Hz`. The frequency heard by the driver of the second car is [velocity of sound `340m//s`].

A

`350 Hz`

B

`361 Hz`

C

`411 Hz`

D

`448 Hz`

Text Solution

Verified by Experts

The correct Answer is:
D
Here, first car is the source, second car is listener
`upsilon_(s) = 22 m//s, nu = 400 Hz`
`upsilon_(L) = 16.5 m//s, upsilon = 340 m//s`
As source and listener move towards eachother, therefore
`nu' = ((upsilon + upsilon_(L)))/(upsilon - upsilon_(s)) = ((340 + 16.5)400)/(340 - 22)`
`= (356.5)/(318) xx 400 = 448 Hz`
Promotional Banner

Topper's Solved these Questions

  • GRAVIATION

    PRADEEP|Exercise Multiple Choice questions IV.|1 Videos

  • GRAVIATION

    PRADEEP|Exercise Multiple Choice questions V.|1 Videos

  • GRAVIATION

    PRADEEP|Exercise Multiple Choice questions II.|2 Videos

  • BEHAVIOUR OF PERFECT GAS & KINETIC THEORY

    PRADEEP|Exercise Assertion - Reason Type questions|14 Videos

  • KINEMATICS

    PRADEEP|Exercise 1 NCERT Comprehension|4 Videos

Similar Questions

Explore conceptually related problems

Two cars moving in opposite directio approach each other with speed of 22m//s and 16.5m//s respectively . The driver of the first car blows a horn having a frequency 400Hz . The frequency heard by the driver of the second car is [ velocity of the sound 340m//s]

Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be _____ Hz. [Velocity of sound in air is 340 m/s.]

Two trains A and B are moving in the same direction with velocities 30 m/s and 10 m/s respectively, B is behind from A, blows a horn of frequency 450 Hz. Then the apparent frequency heard by B is (The velocity of sound is 330 m/s) :-

Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz . the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 340 m/s )

Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 kmph and 36 kmph. If first car blows horn of frequency 300 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45° angle with the roads will be (Speed of sound = 330 m/s)

Two cars are moving on two perpendicular road towards a crossing with uniform speeds of 72km//hr and 3km//hr . If first car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45^@ angle with the roads, will be

A train is moving with speed 72 km/h towards a hill blows a whistle of frequency 1240Hz. the frequency of echo heard by driver is(speed of sound=330m/s)

A car travelling towards a hill at 10 m//s sound its horn which a frequency 500 H_(Z) . This is heard in a second car travelling behind the first car in the same direction with speed 20 m//s . The sound can also be heard in the second car by reflections of sound the hill. The beat frequency heard by the driver of the sound car will be (speed of sound in air = 340 m//s)

Knowledge Check

  • Two cars moving in opposite directio approach each other with speed of 22m//s and 16.5m//s respectively . The driver of the first car blows a horn having a frequency 400Hz . The frequency heard by the driver of the second car is [ velocity of the sound 340m//s]

    A
    `350Hz`
    B
    `361Hz`
    C
    `411Hz`
    D
    `448Hz`

  • Two cars moving in opposite directions approach each other with speed of 22m/s and 16.5 m/s respectively . The driver of the first car blows a hrom having a frequency 400 Hz . The frequency heard by the driver of the second car is [velocity of sound 340 m/s]

    A
    350 Hz
    B
    361 Hz
    C
    411 Hz
    D
    448 Hz

  • Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver or the first car blows a horn having a frequency 400 Hz .The frequency heard by the driver of the second car is (velocity of sound 340 m/s):

    A
    361 Hz
    B
    411 Hz
    C
    448 Hz
    D
    350 Hz