Click on the radio buttons in front of the correct answers to the questions.
1. This is thought to be the waves caused by the vibration of the object, whether or not they are heard by the ears
light sound gravity
2. Sound waves travel through the air
by vibrating or moving the particles of matter in the air
by the force of gravity pulling them to the earth
by magnetic force
3. There must be particles in the air for sound to be heard.
True False
4. The sound waves below 20 waves per second
supersonic subsonic ultrasonic
5. Sound waves of more than 20,000 waves per second are
ultrasonic subsonic supersonic
6. Sound waves that are regular and organized making them pleasing to the ear are called
noise music cacophony
7. The crowding together of the molecules of air is called
rarefaction condensation evaporation
8. A lessening in the air of the molecules is called