Earth is moving towards a fixed star with a velocity of `30 kms^(-1)`. An oberver on earth observes a shift of `0.58 Å` in wavelength of light coming from star. What is the actual wavelength of light emitted by star ?

Explanation

Here, `v = 30 ikm s^(-1) = 3 xx 10^(4) ms^(-1)`,
`Delta lambda = 0.58 Å, lambda = ?`
As `Delta lambda = (v)/(c )lambda`
`:. lambda = ( c)/(v) Delta lambda = (3 xx 10^(8))/(3 xx 10^(4))(0.58) = 5800 Å`