# Physics

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A vibrating 1000-hertz tuning fork produces sound waves that travel at 340 meters per second in air. Points A and B are some distance from the tuning fork. Point P is 20. meters from the tuning fork.

1. If the waves are in phase at point A and B, what is the minimum distance separating points A and B in terms of wavelength?

2. If the vibrating tuning fork is accelerated toward point P, what happens to the frequency of the sound observed at P?

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