a. Suppose you recreate James Joule's paddlewheel experiment but replace the water (which has a specific heat of 4182 J/(kg K)) with an equal mass of ethanol (which has a specific heat of 2420 J/(kg K)). The temperature change of the ethanol with respect to the temperature change of the water for the same hanging mass drop would be about:

Group of answer choices

100% smaller

50% smaller

the same

50% larger

100% larger

b. You want to strike a particular target on the wall in the air above you with a laser pointer held from underwater. Given that water has an index of refraction of 1.33 and air an index of refrection of 1.00, what angle incident to the surface of water from below in degreesmust you hold the laser pointer so that it refracts into the air at 45.0 to strike the wall where you intend to three significant digits?

c. Analyzing the voice of another human, you are able to measure its sound intensity peaks at 90 cycles per second. What is thedistance in metersbetween the peaks of pressure compressiontotwo significant digits?