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(A) According to the Doppler effect for light,when a source of light moves away from an observer,the observed frequency decreases and the wavelength i

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$A$ shift in frequency towards the red end

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(A) According to the Doppler effect for light,when a source of light moves away from an observer,the observed frequency decreases and the wavelength increases.Since the universe is expanding and distant stars are receding from us,the light emitted by these stars undergoes a Doppler shift towards longer wavelengths.This phenomenon is known as a 'red shift' because the shift is towards the red end of the visible spectrum.Therefore,the spectral line from a receding star,when compared with the corresponding line from a stationary source,will show a shift in frequency towards the red end.

Hubble showed that the universe as a whole is expanding and the distant stars are receding from us. The spectral line from a star,when compared with the corresponding line from a stationary source,will then show:

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