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Two sources of sound placed close to each other are emitting progressive waves given by y1 = 4 sin 600 πt and y2 = 5 sin 608 πt. An observer located near these two sources of sound will hear :
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- 4 beats per second with intensity ratio 25 : 16 between waxing and waning.
- 8 beats per second with intensity ratio 25 : 16 between waxing and waning
- 8 beats per second with intensity ratio 81 : 1 between waxing and waning
- 4 beats per second with intensity ratio 81 : 1 between waxing and waning
Correct Option: D
2π ƒ1 = 600 π
ƒ1 = 300 ... (1)
2π ƒ2 = 608 π
ƒ2 = 304 ... (2)
|ƒ1 – ƒ2| = 4 beats
| = | = | = | |||||
| Imin | (A1 + A1)² | (5 - 4)² | 1 |
where A1,A1 are amplitudes of given two sound wave.
