A star is moving towards the earth with a speed of $4.5 imes 10^{6}m/s$. If the true wavelength of a certain line in the spectrum received from the star is $5890\ \mathring{\mathrm{A}}$, its apparent wavelength will be about $(c = 3 imes 10^{8}m/s)$

Question

A star is moving towards the earth with a speed of $4.5 	imes 10^{6}m/s$. If the true wavelength of a certain line in the spectrum received from the star is $5890\ \mathring{\mathrm{A}}$, its apparent wavelength will be about $(c = 3 	imes 10^{8}m/s)$

Dr. Abubacker · Accepted Answer

(c) $\lambda^{'} = \lambda\left( 1 - \frac{v}{c} ight) = 5890\left( 1 - \frac{4.5 	imes 10^{6}}{3 	imes 10^{8}} ight) = 5802\mathring{\mathrm{A}}$

Q. A star is moving towards the earth with a speed of $4.5 \times 10^{6}m/s$. If the true wavelength of a certain line in the spectrum received from the star is $5890\ \mathring{\mathrm{A}}$, its apparent wavelength will be about $(c = 3 \times 10^{8}m/s)$

Explanation

Reviewed by Dr. Abubacker

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