The Doppler effect is applicable for

If a star emitting light of wavelength $5000\,\mathring{A}$ is moving towards Earth with a velocity of $1.5 \times 10^6\,\text{m/s}$,then the shift in the wavelength due to Doppler's effect will be......$\mathring{A}$

If the shift of wavelength of light emitted by a star is towards the violet end of the spectrum,then this shows that the star is

$A$ star is moving away from the Earth. An observer on the Earth will see the wavelength of light coming from the star as:

The Doppler effect is applicable for

$A$ spectral line $\lambda = 5000\ \mathring A$ in the light coming from a distant star is observed as $5200\ \mathring A$. What will be the recession velocity of the star?