Page 52 - Science Course 3 (Book 2)

Mo10-L1: Key Concept Organizer

Direction: Circle the term in parentheses that correctly completes each sentence.

1. Waves always begin with a source of energy that causes a back-and-forth or up-and-down
(transfer/disturbance).

2. Waves transfer energy, not (heat/matter), from place to place.

3. The way in which waves transport energy (differs/is the same).

4. A(n) (electromagnetic/mechanical) wave forms when a source of energy causes particles that make up a
medium to vibrate.

5. A (mechanical/transverse) wave that is produced by a vibrating electric charge is an electromagnetic wave.

6. (Longitudinal/Electromagnetic) waves are always mechanical waves because this type of motion can
occur only when energy passes from particle to particle of a medium.

7. Two familiar types of waves in nature are seismic waves produced by (tornadoes/earthquakes) and water
waves.

8. You can describe waves by their (properties/heights).

9. The speed of a wave depends on the medium, or (strength/type) of material, through which it travels.

10. Waves can carry different amounts of (energy/water).

Mo10-L1: Key Concept Check

Direction: On each line, write the term from the word bank that describes the statement. Some terms
will be used more than once.

absorption diffraction ref ection refraction transmission

1. Radio waves carry energy from an antenna to a plane.

2. A plane ref ects the radio waves back toward an antenna.

3. A plane and particles in the air absorb some energy. The ref ected wave
carries less energy than the original wave.

4. When someone knocks on a door, sound energy changes to thermal energy
and remains in the door.

5. Some of the energy used to knock on a door ref ects, or bounces back.

6. Some of the sound from a knock passes through the door.

7. Instead of passing through the door, energy from a knock increases the
motion of the particles in the wood.

8. This is the change in direction of a wave when it travels past the edge of an
object or through an opening.

9. This is the change in direction of a wave as it changes speed, moving from
one medium into another.

10. An object blocks the path of a wave, causing the wave to change direction.

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