Match the following colours of light with their frequencies.
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", "advice": "Remember: $\\frac{SIN(\\theta_i)}{SIN(\\theta_r)}$ = $\\frac{n_r}{n_i}$
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\nans = [[0]] Hz
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\n$f_o \\frac{v\\frac{+}{-} v_o}{v \\frac{+}{-}v_s}$
\nwhere ${f_o}$ is the observed frequency,v is the velocity of sound, ${v_o}$ is the velocity of the observer and ${v_s}$ is the velocity of the source.
\nIf the source and the observer are both moving in the same direction, which of the following statements is true?
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