InterviewSolution
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InterviewSolution
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What speed should be galaxy move with respect to us to the sodium line at 589.0 nm is observed at 589.6nm? |
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Answer» Solution :Since `v LAMDA=c, (DELTA v)/v=-(Delta lamda)/(lamda) `(for small changes is v and `lamda`) for `Delta lamda=589.6-589.0=0.6nm` `:.(Deltav)/v=-(Delta lamda)/(lamda)=(v_("RADIAL))/c` or `v_("radial")~=+c(0.6/58.0)=+3.06xx10^(5)ms^(-1)=306km//s` Therefore, the galaxy is moving away from US. |
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