The red shift of radiation froma distance nebula consits of light known to hace a wavelength of 434 nm. In the laboratory, this wavelength appears to be 6562 `Å.` What is the speed of the nebulal in the line of sight relative to the earth ? Is it approching or receding ?

The wavelength of yellow sodium line (5896 Å) emitted by a star is red shifted to 6010 Å. What is the component of the star's recessional velocity along the line of sight? Speed of light = 3xx10^(8)ms^(-1) .

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 ?

The intensity of light from a continuously emitting laser source operating at 638 nm wavelength is modulated at 1 GHz . The modulation is done by momentarily cutting the intensity off with a frequency of 1 GHz . What is the farthest distance apart two detectors can be placed in the line of the laser light so that they can see the portions of the same pulse simultaneously ? ( consider the speed of light in air 3 xx 10^8 m//s )

A rocket is going away from the earth at a speed of 10^(6) m/s . If the wavelength of the light wave emitted by a light source on it is 5400 Å , what will be its Doppler Shift ?