1. What is the danger posed by people in the balcony of an auditorium stamping their feet in a steady rhythm? 2. What is the fundamental source of electromagnetic radiation? 3. Which has the shorter...

1. What is the danger posed by people in the balcony of an auditorium stamping their feet in a steady rhythm?

2. What is the fundamental source of electromagnetic radiation?

3. Which has the shorter wavelengths—ultraviolet or infrared? Which has the higher frequencies?