I need to impress a girl by helping her cousin out with some physics calculation
(never in my life I though I would write that sentence =),
though it was a looong time ago I tried to solve anything like this.
Maybe you guys can help me out, should be a piece of cake. ;)
1. A microwave oven discharges microwaves with a frequency of 2.45 GHz.
a) Determine the wavelength of the microwaves.
b) Determine the energy of the microwaves.
c) At a certain point of time, 3 x 10^26 photons / sec are produced.
What is the effect of the microwave?
2. A violin cord is 32.5 cm long. The E-cord has a frequency of 660Hz, how much shorter do you have to cut it so it gives an A-tone (880Hz)?
I know these questions are elementary but my mind has hidden my knowledge very deep it seems...
Thanks for the help guys!