5. Examples of mediums… Sound waves = AIR Ocean waves = WATER   Not all waves need a medium. Light and radio waves travel through space.

10.   What do they look like? TRANSVERSE WAVES— Have alternating high points (crests) and low points (troughs).

20.   This relationship is always true— as frequency increases, wavelength decreases. f ↑ = λ↓

22. SPEED = WAVELENGTH X FREQUENCY v = λ x f Example: (do on your own) λ = 3 m, f = 10 Hz

25. If you’ve ever been knocked over by an ocean wave, you know that the higher the wave, the more energy it carries.

28. DIFFUSE REFLECTION— ROUGH SURFACES

32. When the sound waves strike an object, the waves are reflected back the to the bat.

35. These sound waves form images of her fetus.

41. The pencil looks like it is broken at the surface of the water.

45. DESTRUCTIVE--SUBTRACT