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Q. A pair of in-phase stereo speakers is placed side by side, 0.90m apart. You stand directly in front of one of the speakers, 1.2m from the speaker.What is the lowest frequency that will produce constructive interference at your location?

Q. A projectile is fired at an upward angle of 45° from the top of a 286 m cliff with a speed of 157 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)

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