Warm Up NB p 99 Week 20 Jan

Warm Up NB p 99 Week 20 Jan 21 – 25 Wed 23 rd Properties of Waves Obj: SW explore the properties of waves by taking notes and answering questions. Homework: • EM Spectrum Foldable (due Jan 25 th) Warm Up: (use complete sentences) 1. Draw a wave train for transverse waves and another wave train for longitudinal waves: label wavelength & amplitude on each.

Transverse Wave Longitudinal Wave Amplitude

Table of Contents Date: 1/16 1/15 1/17 1/22 1/21 1/22 1/23 NB p 91 Title: Waves Webquest EM Spectrum Foldable Notes – Mechanical Wave Basics Mechanical Waves WS Wk 20 Warm-ups Quiz #4 Notes – Properties of Waves Agenda *Stamp & Collect Mechanical Waves WS * Notes – Properties of Waves *Work on Foldables as time allows Page: 95 96 97 98 99 100 101

Properties of Waves NB p 101

*Wave Motion � *Waves travel in straight lines until they encounter a barrier ◦ *Barriers include: a new medium, same medium different density, end of current medium � Once ◦ ◦ Be Be they hit a barrier waves can: reflected refracted diffracted absorbed �Often what really happens is that some combination of each of the listed actions

� *the amplitude of a wave changes when the wave passes to a new medium that has a different density.

*Reflecting Waves � *waves can bounce off of a barrier, changing directions. ◦ The angle at which they bounce is the same angle that they hit the barrier. �Think playing billiards (pool) �*draw right-hand picture

$*Refracting Waves �* the waves changes direction as it passes through a barrier. ◦$

*Refracting Waves �* the waves changes direction as it passes through a barrier. ◦ *water ◦ *glass

$*Diffraction � *change in direction of waves as they pass through an opening or$

*Diffraction � *change in direction of waves as they pass through an opening or around a barrier in their path ◦ water waves – waves bend into the beach or harbor ◦ *sound waves – bend around corners, how you can hear something from another room

*Absorption � *waves barrier can be wholly or partial absorbed by a ◦ *particles of the barrier absorb the energy of the wave but do not vibrate enough to allow the wave to continue ◦ sound proofing a room ◦ Light darkening shades for a room