The hydrogen balmer line hβ has a wavelength of 486.1 nm. it is shifted to 563.9 nm in the spectrum of 3c 273. for this quasar, find the apparent radial velocity v of the quasar. express your answer in fractions of c (for example, v = 0.9 c).
v = .

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The star nearest to our sun is proxima centauri, at a distance of 4.3 light-years from the sun. how far away, in km, is proxima centauri from the sun?

Arope has one end tied to a vertical support. you hold the other end so that the rope is horizontal. if you move the end of the rope back and forth with a frequency of 4 hz, the transverse wave you produce has a wavelength of 0.5 m. what is the speed of the wave in the rope?