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Posted by on Friday, December 14, 2012 at 12:36pm.

The yellow line emitted by a helium discharge tube in the laboratory has a wavelength of 587 nm
The same yellow line in the helium spectrum of a star has a measured
wavelength of 590 nm.

Calculate the speed of the moving star.

  • physics - , Friday, December 14, 2012 at 12:57pm

    Doppler effect
    Frequency (observed) f=c/λ=3•10⁸/5.87•10⁻⁷=5.11•10¹⁴ Hz
    Frequency (apparent) f´=c/λ´=3•10⁸/5.9•10⁻⁷=5.085•10¹⁴ Hz
    f'=cf/(c+u)

    u=c{(f/f´)-1} =1.53•10⁶ m/s

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