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3.a) given,frequency=500 Hzwavelength=0.66 mwe know,velocity=frequency×wavelengthvelocity=500×0.66=330 m/s  b) i) we know,speed of wave in liquid medium is more than speed in gaseous,A is travelling faster.ii) we know,molecular mass of CO2=44molecular mass of H2=2and speed of wave=1molecular massso,B is travelling faster.
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a) frequency= velocity/wavelength => velocity= frequency* wavelength
b) (i) A is travelling faster
(ii) B is travelling faster
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