Friday... We plowed through the key definitions, looked at some video clips (I'm putting them onto the website soon, so look online if you are interested in seeing them again).
The homework is due Monday. We didn't have time to work through numerical examples, but do your best.
Here's a few answers that might help:
2d) one wave every two seconds, means 1 wave/2 sec = 0.5 waves/sec
2e) use the frequency of the above problem (f=0.5 Hz), use the given speed v= 3 m/s. Use the equation velocity= frequency x wavelength --> so wavelength = velocity/frequency = 3 m/s / 0.5 waves/sec = 6 meters/wave.
Notice that the UNITS are all in there.
4d) Radio waves travel at the speed of light. v=3 x 10^8 m/s. The frequency is 85.5 MHz, which is 8.55 x 10^7 Hz (85.5 x 10^6 Hz). So, velocity= frequency x wavelength --> so wavelength = velocity/frequency = (3 x 10^8 m/s )/ (8.55 x 10^7 cycles/sec) = 3.5 m/cycle
So the wavelength is 3.5 meters long.
5c) this is kinda a trick question. the velocity is determined by the medium, not the frequency.
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