1 Wave Optics
A galaxy is moving away from an observe on the earth so that sodium light of wavelength $$ 5892\overset{\text{o}}{\mathop{\text{A}}}\, $$ is observed at $$ 5896\overset{\text{o}}{\mathop{\text{A}}}\, $$ . The speed of galaxy is
1) $$ 306\,\,km/s $$ 2) $$ 204\text{ }km/s $$ 3) $$ 185\,km/s $$ 4) $$ 158\text{ }km/s $$
Solution:
$$ v=C\frac{\Delta \lambda }{\lambda } $$
$$ =3\times {{10}^{8}}\times \frac{(5896-5892)}{5892} $$
$$ =0.00204\times {{10}^{8}}=204\,km/s $$
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