Home
Class 11
PHYSICS
A rocket is going away from the earth at...

A rocket is going away from the earth at a speed 0.2 c , where c = speed of light. It emits a signal of frequency `4 xx 10^(7)Hz` . What will be the frequency observed by an observer on the earth

A

`3.2xx10^(7)Hz`

B

`4.8xx10^(7)Hz`

C

`4.0xx10^(7)Hz`

D

`5.3xx10^(7)Hz`

Text Solution

Verified by Experts

The correct Answer is:
B
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A star moves away from earth at speed 0.8 c while emitting light of frequency 6 xx 10^(14) Hz . What frequency will be observed on the earth (in units of 10^(14) Hz) (c= speed of light)

A rocket is going away from the earth at a speed of 10^(6) m/s . If the wavelength of the light wave emitted by a light source on it is 5400 Å , what will be its Doppler Shift ?

Knowledge Check

  • A rocket is moving away from the earth at a speed of 6 xx 10^(7) m//s . The rocket has blue light in it. What will be the wavelength of light recorded by an observer on the earth (wavelength of blue light = 4600 Å )

    A
    `4600 Å`
    B
    `5520 Å `
    C
    `3680 Å `
    D
    `3920 Å `

  • A star moves away from the earh at a speed of 0.8 c while emitting light of frequency 6 xx 10^(14) Hz . What frequency will be observed on the earth ( in units of 10^(14) Hz) ? ( c=speed of light )

    A
    0.24
    B
    1.2
    C
    30
    D
    3.3

  • A rocket is going away from the earth at a speed of 10^(6)m//s . If the wavelength of the light wave emitted by it be 5700 Å , what will be its Doppler's shift

    A
    `200 Å`
    B
    `19 Å`
    C
    `20 Å`
    D
    `0.2 Å`

    • Similar Questions

    Explore conceptually related problems

    A train is approaching towards a platform with a speed of 10 ms^(-1) , while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform ? (given, speed of sound =340 ms^(-1) )

    An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10GHz . What is the frequency of the microwave measured by the observer ? ( speed of light =3xx10^(8)ms^(-1))

    A star is going away from the earth. An observer on the earth will see the wavelength of light coming from the star

    A source and an observer are moving towards each other with a speed equal to v/2 where v is the speed of sound. The source is emitting sound of frequency n . The frequency heard by the observer will be

    An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GhHz. What is the frequency of the microwave measured by the observer? (speed of light= 3xx10^(8)ms )

    Home
    Profile