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Earth is moving towards a fixed star with a velocity of 30 kms^(-1) . An observer on earth observes a shift of 0.58 Å in wavelength of light coming from star. What is the actual wavelength of light emitted by star ?

Earth is moving towards a fixed star with a velocity of 30 kms^(-1) . An oberver on earth observes a shift of 0.58 Å in wavelength of light coming from star. What is the actual wavelength of light emitted by star ?

The apparent wavelength of light from a star moving away from earth is observed to be 0.01% more than its real wavelength. The velocity of star is

A star is moving away from the obsever on the Earth with a speed of 400 km/s. What will be the Doppler shift if the wavelength of light emitted by the star is 5800 Å ?

A star is observed through a telescope. The diameter of the objective of the telescope is 203.2 cm. The wavelength of the light, coming from the star to the telescope is 6600Å. Find the resolving power of the telescope.