Todays Topic TransverseLongitudinal Waves Learning Goal SWBAT quantify

Today’s Topic: Transverse/Longitudinal Waves Learning Goal: SWBAT quantify the differences between transverse and longitudinal waves and identify their uses. �A sound wave of 250 Hz travels in 31 °C air. �What is the wavelength of this wave? �Another sound wave of 5, 265 Hz travels 31 °C in air. �What is the wavelength of this wave? �What do you notice about the wavelength as frequency increases?

Homework �Due Wednesday, 6/3: �Complete the Wave Speed Worksheet �One Day Late: �Pendulum Lab �Simple Harmonic Motion Worksheet

Types of Waves �With this big slinky and two volunteers, let’s go into the hallway to demonstrate two different types of waves. �What is similar between these two waves? �What is different between these two waves?

Wave Types �What we just saw are an example of the two different types of waves that exist: Transverse Waves and Longitudinal Waves. �Whenever the motion of the medium is at right angles to the direction in which a wave travels, the wave is a transverse wave. Motion of Medium Wave direction

Transverse Waves �One of the types of waves we saw with the slinky was a Transverse Wave. �Which wave was the transverse wave? �How do you know? �Here are some other examples of transverse waves.

Transverse Waves �Guitar Strings (Slow Motion Video) �Snare Drums and Cymbals (Video) �All electromagnetic waves (light, infrared, UV, Gamma, etc. )

Longitudinal Waves �Not all waves are transverse waves. �As seen in the slinky, sometimes the particles of the medium travel in the same direction as the wave. �When the particles oscillate parallel to or along the direction of the wave (rather than right angles to it) the wave is a longitudinal wave. Motion of Medium Wave direction

Longitudinal Waves �Sound waves are longitudinal waves.

Longitudinal Waves �This air cannon is another example. �Shockwaves are also examples of longitudinal waves

Conceptual Check �Where can you find Transverse Waves in music? �Where can you find Longitudinal Waves in music?

Conceptual Check �What types of waves do you see at the beach or in a puddle? �Are these transverse or longitudinal waves?

�Let’s focus on one dot a time…

Conceptual Check �They are technically BOTH longitudinal and transverse. �These are called surface waves.

�Has Longitudinal Properties: �And Transverse Properties:

�Add them together! (Up and down, and side-to-side motion)

More Examples �A bunch of people are standing in line outside of Game. Stop to get their copy of Halo 5. A jerk in the back of the line pushes the kid in front of him, who pushes the kid in front of him, etc… �What type of wave is this? pulse direction

More Examples �A crowd at a Rutgers Football Game are pretty excited at how the game is going. �To show their excitement, they begin to do “the wave”. �What type of wave this?