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The spectral line for a given element of light
\( \mathrm{P} \) received from a distant star is shifted towards

W. longer wavelength side by \( 0.025 \% \). The velocity of star in the line of sight is
(a) \( 7.5 \times 10^{4} \mathrm{~m} \mathrm{~s}^{-1} \)
(b) \( -7.5 \times 10^{4} \mathrm{~m} \mathrm{~s}^{-1} \)
(c) \( 3.7 \times 10^{4} \mathrm{~m} \mathrm{~s}^{-1} \)
(d) \( -3.7 \times 10^{4} \mathrm{~m} \mathrm{~s}^{-1} \)
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