In this interactive activity adapted from the University of Utah's ASPIRE Lab, learn about the frequency and period of an oscillating object. Vary the time it takes a child to jump up and down on a trampoline to see how that changes the frequency of the jumping motion. Next, change the period of a pendulum by adjusting the length of its string and see the mathematical relationship between period and frequency. Finally, see how the electromagnetic spectrum consists of a range of frequencies.