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Q.Two loudspeakers in a 20^circ {rm{C}} room emit 690 Hz sound waves along the x-axis.

What is the smallest distance between the speakers for which the interference of the sound waves is destructive?

Q. A basketball is thrown with an initial speed of 4.0 m/s as shown in the above figure. A straight line drawn from the release point to the landing point makes an angle of 30 degrees with the horizontal. What is the release height?

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