time=distance/speed
1.6/100 secs = 0.016secs=16millisecs
Think its Positive
hope this helpes
Because dark line spectra result from passing white light through ionized gasses and plasmas, which is what the atmosphere of stars are made of. These frequencies are scattered by the star's atmosphere as it leaves the surface (photosphere) of the star, and don't make it to earth.
Wave speed = frequency * wavelength
Wave speed = 4 * 25
Wave speed = 100 m/s
