A star is moving towards the earth with a speed of `4 xx 10^(7) m//s`. If the wavelength emitted by the star is `500 nm`, what would be the change in wavelength received on earth ?
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Here, `v = 4 xx 10^(7) m//s, lambda = 500 nm` `Delta lambda = ?` From `Delta lambda = -(v)/( c)lambda = -(4 xx 10^(7))/(3 xx 10^(8)) xx 500 nm` `Delta lambda = - 66.7 nm` Negative sign implies decrease in the observed wavelength.
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