First slide

Doppler

Question

The apparent wavelength of light from a star moving away from the earth is 0.02% more than the actual wavelength.'What is the velocity of star ?

Moderate

A

30 km/s
B

60 km/s
C

90 km/s
D

non of the above

Solution

$\frac{Δ λ}{λ} = \frac{V}{C} \frac{0 \cdot 20}{100} = \frac{V}{3 \times 10^{8}} o r V = \frac{0 \cdot 02 \times (3 \times 10^{8})}{100} v = 60 k m / s$

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