Problem on person detects little or no sound, Physics

Problem on person detects little or no sound

Two speakers are placed side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5 meter and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (the sound speed is 340 m/s)

a) 8.4 m

b) 9.1 m

c) 8.1 m

d) 7.7 m

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Physics: Problem on person detects little or no sound

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