Home
Class 11
PHYSICS
A siren emitting a sound of frequency 80...

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of `15 m cdot s^(-1)`. Then the frequency of sound that the observer hears in the echo reflected from the cliff is (take velocity of sound in air = 330 m `cdot s^(-1))`

A

800 Hz

B

838 Hz

C

885 Hz

D

765 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
Apparent frequency of echo
`n.=n(v/(v-v_(s)))=800(330/(330-15))`
`=(800xx330)/315=838` Hz
The option (B) is correct.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • DOPPLER EFFECT IN SOUND

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|2 Videos

  • DOPPLER EFFECT IN SOUND

    CHHAYA PUBLICATION|Exercise EXAMINATION ARCHIVE WITH SOLUTIONS (AIPMT)|1 Videos

  • CIRCULAR MOTION

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|11 Videos

  • ELASTICITY

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|10 Videos

Similar Questions

Explore conceptually related problems

Determine the frequencies of first three overtones produced in a 50 cm long pipe open at both ends . [Velocity of sound in air = 330 m*s^(-1) ]

If the frequency of a sound wave is 250 Hz and wavelenth is 1.32 m, then what is the velocity of the wave

Knowledge Check

  • To hear the echo of a disyllabic word distinctly, the minimum distance of the reflector should be [velocity of sound in air = 330 m/s

    A
    16.5 m
    B
    33 m
    C
    66 m
    D
    132 m

  • To hear the echo of a sound, the minimum distance between, listener and the reflector should be speed of sound in air =340 m/s)

    A
    17 m
    B
    34 m
    C
    85 m
    D
    170 m

  • The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to (velocity of sound in air 332 m/s)

    A
    33.2 m
    B
    16.6 m
    C
    8.3 m
    D
    4.2 m

    • Similar Questions

    Explore conceptually related problems

    A train sounding a horn of frequency 1000 Hz crosses a station at a unifrom velocity of 50 km h^(-1) Calculate the frequency of the whistle relative to a listener, standing on the platform, before and after the crossing of the station . (velocity of sound = 340 m s^(-1) )

    Find out the frequency of the first overtone emitted by a 1 . 25 m long organ pipe closed at one end. Given , velocity of sound in air = 320 m * s^(-1)

    Find out the frequencies of the fundamental and its nearest harmonic emitted by a 1 m long closed organ pipe. Given, velocity of sound in air 332 m * s^(-1) .

    Two sources , separated by a certain distance, are each producing a sound of frequency 1360 Hz . A listener from the middle of the two sources starts moviing towards a source . If the number of beats heards by the listener per sound is 4, calculate his speed . Velocity of sound in air = 340 m s^(-1)

    Find out the fundamental frequency of a 125 cm long organ pipe closed at one end . Given, velocity of sound in air = 350 m*s^(-1) .

    Home
    Profile