Two waves of equal amplitude and equal frequency travel along the same path in opposite directions
B
Two waves of equal wavelength and equal amplitude travel along the same path with equal speeds in opposite directions
C
Two waves of equal wavelength and equal phase travel along the same path with equal speed
D
Two waves of equal amplitude and equal speed travel along the same path in opposite direction
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B
Two waves of equal wavelength and equal amplitude travel along the same path with equal speeds in opposite directions
b (b)
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A student is performing the experiment of resonance column. The diameter of the column tube is $6 \,cm$. The frequency of the tuning fork is $504\, Hz$. Speed of the sound at the given temperature is $336\, m / s$. The zero of the meter scale coincides with the top end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is..........$cm$
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