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Online Quiz (Worksheet A B C D)

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Upper Elementary Science - II
4.7 Sound - Vibrations

A bell rings, a dog barks, an alarm clock rings. Everyday is full of familiar sounds. But what exactly is sound? Here is an example to show how sound makes the air vibrate. Stretch a piece of plastic wrap over the surface of a plastic bowl and fasten it tightly with a rubber band. Sprinkle a few grains of dry sand or rice on the plastic. Now take a big pan, hold it near the bowl, and strike it with a spoon a few times. The grains jump when you hit the pan. This is because the pan is vibrating, which causes the air and then the plastic to vibrate. Vibrating air is called sound waves.

Sound waves move out from a vibrating object in all directions, making the air move back and forth in a way that we cant see. Sounds compress and decompress the air, pushing and them relaxing, making invisible vibrations. Those back and forth vibrations spread out from the source that made them, getting weaker as they get farther away. Thatís why a person standing close is heard more clearly than someone calling from across the street.

Directions: Answer the following questions.
Q 1: Sound waves travel through ___ states of matter

Q 2: How does sound move through a liquid that has particles that are far apart?
not at all

Q 3: Reflected sound waves may be heard as _____
a noise
an echo
a pitch

Q 4: Matter moving back and forth very quickly causes

Q 5: A thick string on a guitar will give a
squeaky sound
high pitch
low pitch

Q 6: Sound happens when matter moves back and forth very quickly and

Q 7: Pitch is highness and lowness of a sound.

Q 8: Sound travels through the air in __________ that look like ripples on a pond.

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!

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