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The velocity of sound in a gas, in which two wavelengths 4.08 m and 4.16 m produce 40 beats in 12 s, will be:

1. 282.8 ms –1
2. 175.5 ms –1
3. 353.6 ms –1
4. 707.2 ms –1

Correct answer: 707.2 ms –1

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