A sensor watches a plucked guitar string and records that the string swings 3 mm away from its rest position at the widest point of its swing. Which term names that measurement?

Standing on a pier, a student times the swells and measures 8 m from the top of one swell to the top of the next. Which term names that 8 m distance?

A tuner counts 262 complete back-and-forth vibrations of a piano string in one second and reports the count on its display. Which unit does it report that count in?

A student pushes one end of a long spring and watches a pulse run along it. Along the way, some coils are squeezed close together and other coils are spread apart. Which term names the squeezed regions?

A teacher turns a speaker dial and the same steady note becomes much easier to hear from the back row. Which term names the property that changed?

Two tuning forks are struck equally hard. The second one produces a note that a listener describes as much higher than the first. Which term names the property the listener is describing?

A probe traces a water wave as a graph. A student marks the lowest point of the trace, the point that sits farthest below the rest line. Which term names that point?

A detector aimed at a warm engine block measures waves with wavelengths a little longer than red light but shorter than microwaves. Which part of the electromagnetic spectrum did it measure?

At noon the black asphalt of a playground gets hot enough to burn bare feet, while almost no light bounces off it and none passes through. Which term names what the asphalt did to the sunlight?

A pencil standing in a glass of water looks broken at the water line, because the light changes direction as it leaves the water and enters the air. Which term names that change?

A research boat sends a sound pulse down into the ocean. The pulse meets a whale, and part of it returns to a microphone on the boat. Which term names what the whale did to the pulse?

In a hospital scan, waves pass straight through the soft tissue of a hand and reach the detector on the far side, while the bones stop most of them. Which term names what the soft tissue did?

A ringing bell sits under a glass jar. As a pump removes the air, the ringing fades until nothing can be heard, though the hammer is still striking. Which term names the role the air played for the sound?

Ripples cross a pond from one side to the other. A leaf floating in the middle bobs up and down as they pass but stays in the same spot. Which term names what crossed the pond?

A student shakes one end of a rope up and down. A wave travels along the rope, but each bit of rope only moves up and down. Which term names this type of wave?

A student pushes and pulls one end of a spring. A wave travels along the spring, and each coil moves back and forth along that same direction. Which term names this type of wave?

A hiker shouts into a canyon. A moment later, the same shout reflects off the far canyon wall and arrives back at the hiker's ears as a second, fainter sound. Which term names that second sound?

A song is stored as a long string of 0s and 1s, so copying it over and over does not add extra noise. Which term names that way of storing the song?

Radio waves and gamma rays sit at opposite ends of the same ordered range of waves, which runs from the longest wavelengths to the shortest. Which term names that full ordered range?

Sunscreen blocks a kind of wave from the Sun that has a shorter wavelength and carries more energy than visible light, and that can damage skin cells with too much exposure. Which term names that kind of wave?