If the wavelength of light emitted by a star is shifted towards red end, then the star is -

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

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

Light energy emitted by star is due to

Light energy emitted by star is due to

Earth is moving towards a stationary star with a velocity 100 kms^(-1) . If the wavelength of light emitted by the star is 5000Å, then the apparent change in wavelength observed by the observer on earth will be

A star is receding from earth with a velocity 3 xx 10^(6) m//s . If the actual wavelength of the light emitted by the star is lambda and Delta lambda is the displacement in wavelength as observed on earth then Delta lambda : lambda is -