One speaker generates sound waves with the amplitude a

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One speaker generates sound waves with the amplitude A. How does the intensity change if we add two more speaker at the same place generating sound waves of the same frequency: one with amplitude 4A in the same phase and the other with the amplitude 2A in the opposite phase.

(i) It stays the same.

(ii) It is 3x bigger than before.

(iii) It is 7x bigger than before.

(iv) It is 9x bigger than before.

(v) It is 49x bigger than before.

Reference no: EM131827874

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