41. what is the velocity (speed and direction) relative to earth of a star with a spectral 1 normally seen at 625 nm that is now at 690 nm? (speed of light = 300,000 km/sec) a) 31,200 km/sec toward earth b) 31,200 km/sec away from earth c) 10.4 km/sec toward earth d) 10.4 km/sec away from earth

V = 31200000 m/s = 31200km/s

Explanation:

when star recedes away from earth its wavelength will appear to increae

where c is speed of light

is change in wavelength

is wavelength of star = 625 nm

therefore we have

solving for v

V = 31200000 m/s = 31200km/s

where are the statements without that i cant you

answerhydrogenous sediment;