The radial speed of a galaxy is `1.2 xx 10^(6)m//s` receding away from earth. What is the percentage change in wavelength in the observed spectrum ?
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Here, `v = 1.2 xx 10^(6) m//s` As `v = (Delta lambda)/(lambda) xx c` `:. (Delta lambda)/(lambda) = (c )/(v) = (1.2 xx 10^(6))/(3 xx 10^(8))` `= 0.4 xx 10^(-2)` Percentage increase in wavelength `= 0.4 xx 10^(-2) xx 100` `= 0.4%`
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