Warm Up 6 W A R M U P 6

D. Wave velocity, or v, describes how fast the wave moves forward. v = f x λ Velocity = frequency x wavelength

Example: A water ripple is being sent across a pool of water by a boat that is rocking at a rate of 1.5 hertz. The ripples are measured to be 2 meters apart. How fast are they moving? v = f x λ v = 1.5Hz x 2m v = 3 m/s

E. Amplitude—a measure of the energy in a wave The more energy a wave carries, the bigger its amplitude Which transverse wave has more energy? The bottom wave because it has the biggest amplitude.

III. The Behavior of Waves What do you do when a wave misbehaves????

Reflection Reflection happens when a wave strikes and bounces off an object All types of waves can be reflected.

Normal Angle of incidence Angle of reflection The angle of incidence of a wave is always equal to the angle of reflection.

a. Normal - an imaginary line perpendicular to a reflective surface b. Angle of incidence - the angle formed between the wave and the normal c. Angle of reflection - the angle formed between the reflected wave and the normal

Refraction—the bending of a wave caused by a change in its speed as it moves from one medium to another Slower Faster

Diffraction 1.Diffraction occurs when an object causes a wave to bend 2.Large objects cause more bending 3.Small objects cause less bending

Diffraction

Interference A.Occurs when 2 waves interact Constructive interference—waves add together Destructive interference—waves subtract from each other

Interference

E. Resonance - the ability of an object to vibrate by absorbing energy at its natural frequency

Exit Ticket 4 If a dog whistle has a frequency of 3.0 x 10 4 Hz, what is the wavelength of the sound if the speed of sound is 330 m/s?