# Physics question A level

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#1
D3. 19
Two speakers are set up 13.5m apart in an auditorium, pointing at each other. A pure sound of frequency 256Hz is being played through them. You may assume that the phase difference of the signals as they arrive at the speakers is 0∘. A person is standing on the line joining the speakers, 0.25m from the midpoint. Calculate the phase difference as it would be detected by the person.

D3.20
The person in question D3.19 moves to the midpoint between the speakers (where the sound is loudest due to constructive interference), and then walks towards one speaker until the sound waves cancel out. How far do they walk until they find this point of near silence?
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3 years ago
#2
Moved to Physics
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3 years ago
#3
Try calculating the wavelength first, if you haven't already. You're having to find specific points along the wave.
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