Home
Class 11
PHYSICS
S is source R us reciver. R and S are at...

`S` is source `R` us reciver. `R` and `S` are at rest. `F` Frequency of sound from `S` is `f`. The beat frequency registred by `R` is `(kuf)/(v + u)`, Find `k`. Given, velocity of sound is `v`.

Text Solution

Verified by Experts

The correct Answer is:
2
Sound received one is direct and another by reflected sound from wall
frequency direct received `= f , f = (V - u)/(V)f`

Apparent frequency at reciver after reflection from wall `f' = (V)/(V + u)f' = (V - u)/(v + u) f`
so beat frequency received `= f_(b) = f =- f' = (2u)/(V u)f`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - III|19 Videos

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - IV|8 Videos

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - I|24 Videos

  • SIMPLE HARMONIC MOTION

    RESONANCE ENGLISH|Exercise Exercise|28 Videos

  • STRING WAVES

    RESONANCE ENGLISH|Exercise Exercise|32 Videos

Similar Questions

Explore conceptually related problems

A source of sonic oscillations with frequency n=1700Hz and a receiver are located on the same normal to a wall. Both the source and receiver are stationary, and the wall recedes from the source with velocity u=6.0(m)/(s) . Find the beat frequency registered by the receiver. The velocity of sound is v=340(m)/(s) .

A source of sonic oscillations with frequency n=1700Hz and a receiver are located on the same normal to a wall. Both the source and receiver are stationary, and the wall recedes from the source with velocity u=6.0(m)/(s) . Find the beat frequency registered by the receiver. The velocity of sound is v=340(m)/(s) .

Given frequency of source f=100Hz, v_(s)=20m//s and v=330 m//s. The beat frequencies f_(1) and f_(2) are

A car emitting sound of frequency 500 Hz speeds towards a fixed wall at 4(m)/(s) . An observer in the car hears both the source frequency as well as the frequency of sound reflected from the wall. If he hears 10 beats per second between the two sounds, the velocity of sound in air will be

A source of sound of frequency 300 Hz and a receiver are located along the same line normal to the wall as shown in the figure. Both the source and the receiver are stationary and the wall receeds from the source with velocity 20ms^-1 .If the beat frequency registered by the receiver is 240/x Hz then x is : (Assume V_("sound")=300 m/s).

Two trains A and B approach a station from opposite sides, sounding their whistles. A stationary observer on the platform hears no beats. If the velocities of A and B are 15 m/s and 30 m/s respectively and the real frequency of the whistle of B is 600 Hz, find the real frequency of the whistle of A. (Velocity of sound = 330 m/s)

A stationary observer receives a sound from a sound of freqeuency v_0 moving with a constant velocity v_S=30(m)/(s) The apparent frequency varies with time as shown in figure. Velocity of sound v=300(m)/(s) . Then which of the following is incorrect?

A stationary observer receives a sound from a sound of freqeuency v_0 moving with a constant velocity v_S=30(m)/(s) The apparent frequency varies with time as shown in figure. Velocity of sound v=300(m)/(s) . Then which of the following is incorrect?

Bus moving with speed v forwards a stationary wall. it produces sound of frequency f = 420 Hz. The heard frequency of reflected sound from wall by driver is 490 Hz . Calculate the speed v of bus. The velocity of sound in air is 330 m/s .

A source of sound attached to the bob of a simple pendulum execute SHM . The difference between the apparent frequency of sound as received by an observer during its approach and recession at the mean frequency of the source . The velocity of the source at the mean position is ( velocity of sound in the air is 340 m//s ) [Assume velocity of sound lt lt velocity of sound in air ]

RESONANCE ENGLISH-SOUND WAVES-Exercise- 2 PART - II
  1. The temperature of air in a 900m long tunnel varies linearly form 100 ...

    Text Solution

    |

  2. A point sound is located in the perpendicular to the plane of a ring d...

    Text Solution

    |

  3. Two coherent sources S(f) and S(2) (in phase with ech other) are place...

    Text Solution

    |

  4. Two coherent sources are placed at the corners of a rectangular track ...

    Text Solution

    |

  5. An earthquake generates both transverse (S) and longitudinal (P) sound...

    Text Solution

    |

  6. A man standing in front of a mountain beats a drum at regular interval...

    Text Solution

    |

  7. Loudness of sound from an isotropic point source at a distace of 70cm ...

    Text Solution

    |

  8. The equation of stationary wave along a stretched string is given by y...

    Text Solution

    |

  9. A standing wave y=a sin kx cos omegat is maintained in a homogeneous r...

    Text Solution

    |

  10. The two pipes are submerged in sea water, arranged as shown in figure....

    Text Solution

    |

  11. Two narrow cylindrical pipes A and B have the same length. Pipe A is o...

    Text Solution

    |

  12. In a resonance tube experiment to determine the speed of sound in air,...

    Text Solution

    |

  13. In the experiment for the determination of the speed of sound in air u...

    Text Solution

    |

  14. When a tuning fork vibrates with 1.0 m or 1.05 m long wire of a , 5 be...

    Text Solution

    |

  15. A toy-car, blowing its horn, is moving with a steady spped of 5 m/s, a...

    Text Solution

    |

  16. S is source R us reciver. R and S are at rest. F Frequency of sound fr...

    Text Solution

    |

  17. A source S emitting sound of 300 Hz is fixed on block A which is attac...

    Text Solution

    |

  18. Two vehicles A and B are moving towards each other with same speed u =...

    Text Solution

    |

  19. A small source of sound vibrating at frequency 500 Hz is rotated in a ...

    Text Solution

    |

  20. A source of sonic oscillations with frequency n=1700Hz and a receiver ...

    Text Solution

    |