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1) At a rock concert, the sound intensity 1.0 m in front of the bank of loudspeakers is 0.10 W/m^2. A fan is 30 m from the loudspeakers. Her eardrums have a diameter of 8.4 mm.

How much energy is transferred to each eardrum in one second?

E=______J

2) A wave travels along a string at speed 267 m/s. What will be the speed if the string is replaced by one made of the same material and under the same tension but having twice the radius.

v=____m/s

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