1. The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 5 V AC. For each 1,000 turns in the input coil, how many turns are there in the output coil?

3. Compute the wavelength of the carrier wave of your favorite radio station.

5. Compute the frequency of an EM wave with a wavelength of 1 in. (0.0254 m).

7. Determine the range of wavelengths in the UV radiation band.

9. The filament of a light bulb goes from a temperature of about 300 K up to about 3,000 K when it is turned on. How many times more radiant energy does it emit when it is on than when it is off?

11. A copper cylinder with a temperature of 450 K is found to emit 175 J of energy each second. If the cylinder radiates like a blackbody, what is its surface area?

13. What wavelength EM radiation would be emitted most strongly by matter at the temperature of the core of a nuclear explosion, about 10,000,000 K? What type of wave is this?

15. The blackbody radiation emitted from a furnace peaks at a wavelength of 1.2 x 10^-6 m (0.0000012 m). What is the temperature inside the furnace?