1.

The spectral line for a given element in light received from a distance satr is shifted towards longer wavelength by 0.32 % . What is velocity of star is C = 3 xx 10^(8) m/s

Answer»

`9.6 XX 10^(4)` m/s
`9.6 xx 10^(2)` m/s
`9.6 xx 10^(3)` m/s
`9.6 xx 10^(5)` m/s.

Solution :`(Delta lambda)/(lambda) = 0.32 % = (0.32)/(100) `
Recession SPEED of star is
`U_(s) = C(Delta lambda)/(lambda) `
`U_(s) = 3 xx 10^(8) ((0.32)/(100) ) `
`U_(s) = 9.6 xx 10^(5) ms^(-1)`.
Hence the correct choice is (d) .


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