Parallel Circuit Lab, Picture below, 40 points, want to confirm answers

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?