An oscilllator of frequency 680 Hz drives two speakers. The speakers are fixed on a vertical pole at a distance 3m from each other as shown in the fig. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that these is no reflection of sound from the ground and speed of sound is v = 340 m/s. How far is the person from the pole when he hears a minimum in sound intensity a second time ?

An oscilllator of frequency 680 Hz drives two speakers. The speakers a

1.	An oscilllator of frequency 680 Hz drives two speakers. The speakers are fixed on a vertical pole at a distance 3m from each other as shown in the fig. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that these is no reflection of sound from the ground and speed of sound is v = 340 m/s. How far is the person from the pole when he hears a minimum in sound intensity a second time ?
Answer» 5.6 m 7.8 m 12.4 m 17.6m Answer :A

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