Home
Class 12
PHYSICS
A plice siren emits a sound wave of freq...

A plice siren emits a sound wave of frequency 440 Hz. The speed of sound is 332 m/s. if the siren is moving away from the listerner with a speed of 18 m/s relative to the air and the listerner is moving towards the siren with a speed of 68 m/s relative to the air, then what frequency does the listern hear?

Text Solution

AI Generated Solution

To solve the problem of finding the frequency heard by the listener when a police siren is moving away from them and the listener is moving towards the siren, we will use the Doppler effect formula. Here are the steps to find the solution: ### Step 1: Identify the given values - Frequency of the siren (f) = 440 Hz - Speed of sound (v) = 332 m/s - Speed of the siren (v_s) = 18 m/s (moving away from the listener, so it will be positive) - Speed of the listener (v_o) = 68 m/s (moving towards the siren, so it will be positive) ...
Promotional Banner

Topper's Solved these Questions

  • WAVES

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|65 Videos

  • WAVES

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-A)|55 Videos

  • WAVE OPTICS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-J (Aakash Challengers question))|1 Videos

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - D)|13 Videos

Similar Questions

Explore conceptually related problems

A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s. Frequency of the sound to be heard by the listener is ( Take velocity of sound as 300 m/s )

If a listener L is at rest and the siren in previous illustrantion is moving away from L at a speed of 30(m)/(s) , what frequency does the listener hear?

Two train whistles A and B each have a frequency of 220 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35 m//s . A listener between the two trains is moving towards the right with a speed of 15 m//s . No wind is blowing. What is frequency from A as heard by the listener

A police siren emits a sinusoidal wave with frequency f_(S) = 300 H_(z) . The speed of the sound is 340 m//s . (a) Find the wavelength of the waves if siren is at rest in the air . (b) If the siren is moving at 30 m//s , Find the wavelength of the waves ahead of and behind the source.

Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m//s in a given medium.

A police car horn emits a sound at a frequency 240 Hz. When the car is at rest. If the speed of the sound is 330 m/s the frequency heard by an observer who is approching the car at a speed of 11 m/s is

A source is moving towards an observer with a speed of 20 m / s and having frequency of 240 Hz . The observer is now moving towards the source with a speed of 20 m / s . Apparent frequency heard by observer, if velocity of sound is 340 m / s , is

A source of sound of frequency 1000 Hz moves to the right with a speed of 32(m)/(s) relative to the ground. To its right there is a reflecting surface moving to the left with a speed of 64(m)/(s) relative to the ground. Take the speed of 64(m)/(s) . Relative to the ground. Take the speed of sound in air to be 332(m)/(s) and find (a) The wavelength of the sound emitted in air by the source, (b) the number of waves per second arriving at the reflecting surface, (c ) The speed of the reflected waves and (d) The wavelength of the reflected waves.

The speed of sound waves in air at 300K is 332 m/s. At what temperature will the speed be 574 m/s

A source of sound of frequency 1000 Hzmoves to the right with a speed of 50 m/s relative to the ground. To its right is a reflecting surface moving to the left as shown in figure. Speed of the sound in air is 330 m/s.