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