It is possible to hear beats from the two vibrating sources of frequency
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(b) For hearing beats, difference of frequencies should be approximately $10 Hz.$
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In a resonance tube experiment when the tube is filled with water up to height of $17.0\, cm$ from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of $24.5\, cm$. If the velocity of sound in air is $330\, m / s ,$ the tuning fork frequency is$......Hz$
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