1. Why is the model of an electron moving in a circular orbit around a central positive nucleus a violation of classical physics? What should happen to such an atom?

2. What would happen if the electron were stationary instead of moving in orbit?

3. What is the wavelength of a wave? Illustrate with a diagram. What is the frequency of a wave, and in what units is it expressed? How are these two quantities related to the speed with which the wave travels?

4. What is a typical wavelength for light that we see as red? What is the frequency of this light? What color is the light that has a wavelength two thirds as long? How does its frequency compare with that of red light?

5. Which light in the preceding problem has more energy per photon? What is the ratio of energy per photon for the two wavelengths?

6. In what way are the names VHF and UHF (very-high frequency and ultra-high frequency) chosen appropriately for television channels? Short-wave radio is "short" relative to what?