A light source approaches the observer with velocity \( 0.5 \mathrm...

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A light source approaches the observer with velocity \( 0.5 \mathrm{c} \). Doppler shift for light of wavelength \( 550 \AA \) is
(a) \( 616 \AA \)
(b) \( 1833 \AA \)
(c) \( 5500 \AA \)
(d) \( 6160 \AA \)
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