NAME ___________________________________________ DATE ____________________ HOUR _____
PS Chapter 11
CHAPTER OUTLINE
Section 1: What are waves?
A. Rhythmic disturbances that carry energy without carrying matter are called
______________.
B. Molecules ___________________ wave energy without themselves moving, like a line
of people passing a ball.
C. ____________________ waves use matter to transfer energy.
1. ____________________ wave - wave energy causes matter in the medium to
move up and down or back and forth at right angles to the wave.
2.
____________________________ - matter in the medium moves forward and
backward in same direction as the wave.
D. _______________ waves - compressional waves caused by colliding air molecules
E. _________________________ waves - transfer energy without using matter; produced
by electrically charged particles.
Section 2: Wave Properties
A. ___________________—a measure of how high crests are; the greater the amplitude,
the more energy a wave carries.
B. ____________________ - distance from the top of one crest to the top of the next crest
or from the bottom of one trough to the bottom of the next trough
C. ___________________ - number of wavelengths passing a given point per second
1. Longer wavelengths result in _________________ frequencies.
2. ________________ frequencies result in shorter wavelengths.
3. _______________ and _______________ result from wavelengths and
frequencies of light and sound.
D. Wave _______________ - how fast a wave travels through a medium
1. Mechanical waves travel faster
in a medium in which atoms are
________________ together.
2. Electromagnetic waves travel faster in a medium with _______________ atoms
in it.
Section 3: Wave Behavior
A. ____________________ - when a wave strikes an object or surface and bounces off
B. ____________________ - when a wave bends and changes speed as it moves from one
medium to another
C. _____________________ - the bending of waves around a barrier
D. ______________________ - two or more waves combine and form a new wave.
1. ______________________ interference - the crest of one wave overlaps the
crest of another wave, making a larger wave.
2. _____________________ interference - the crest of one wave overlaps the
trough of another wave, making a smaller wave.
3. If waves with equal amplitude meet crest to trough, they ________________
each other out.
4. Interference can be used in _________________ protection.