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Wave Optics Test - 38
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Wave Optics Test - 38
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  • Question 1/10
    4 / -1
    A star moves away from earth at speed 0.8 c while emitting light of frequency 6 × 1014 Hz. What frequency will be observed on the earth? (in units of 1014 Hz) (c = speed of light)
    Solutions

  • Question 2/10
    4 / -1
    A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength 5500 Å is
    Solutions

  • Question 3/10
    4 / -1
    A heavenly body is receding from earth such that the fractional change in λ is 1, then its velocity is
    Solutions

  • Question 4/10
    4 / -1
    In the spectrum of light of a luminous heavenly body the wavelength of a spectral line is measured to be 4747 Å while actual wavelength of the line is 4700 Å. The relative velocity of the heavenly body with respect to earth will be (velocity of light is 3 × 108 m/s)
    Solutions

  • Question 5/10
    4 / -1
    The wavelength of light observed on the earth, from a moving star is found to decrease by 0.05%. Relative to the earth the star is
    Solutions

  • Question 6/10
    4 / -1
    A star is going away from the earth. An observer on the earth will see the wavelength of light coming from the star
  • Question 7/10
    4 / -1
    A star is moving towards the earth with a speed of 4.5 × 106 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 Å, its apparent wavelength will be about [c = 3 × 108 m/s]
    Solutions

  • Question 8/10
    4 / -1
    Due to Doppler\'s effect, the shift in wavelength observed is 0.1 Å for a star producing wavelength 6000 Å. Velocity of recession of the star will be
    Solutions

  • Question 9/10
    4 / -1
    When the wavelength of light coming from a distant star is measured it is found shifted towards red. Then the conclusion is
  • Question 10/10
    4 / -1
    The velocity of a moving galaxy is 300 km s–1 and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as 0.5 nm. Then, the actual wavelength of the spectral line is
    Solutions

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