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Mechanical Properties of Fluids
Question
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A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency 5.13 Hz. The unknown frequency is

  • 250 Hz

  • 246 Hz

  • 240 Hz

  • 260 Hz

Answer

A.

250 Hz

Here,

Hence, the unknown frequency is 254 Hz.

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