4. Suppose you mount a video camera on a tripod and aim the camera at one point on a Slinky. You also place a clock next to the Slinky, so the video camera records the time. When you look at the video of a wave going by on the Slinky, how could you measure the frequency?
3. Suppose you took a photograph of a wave on a Slinky. How can you measure wavelength by looking At the photograph?