Sound

Sound is a form of energy produced by ______________.

• vibrations

• distances

• prisms

• transformations

TRUE or FALSE:

Sound travels in waves

• True

• False

What is vibration?

• How loud a sound is.

• How high or low a sound is.

• The back and forth movement of matter.

• The loudness or softness of a sound.

Why would a school build a library with carpet on the floor?

• So the students can make a lot of noise.

• To look nicer.

• To help absorb any sounds to keep it quiet.

• To use one of the many carpets they have.

Sound loudness is measured in:

• Kilograms (kg)

• Kilometres (km)

• Newtons (N)

• Decibel (dB)

A loud sound:

• Can be heard less further away than a soft sound.

• Cannot be heard.

• Will be heard the same as a quiet sound as you travel further away.

• Can be heard further away than a soft sound.

When you hear music, what is your ear actually detecting?

• Notes from the speaker.

• Waves created by vibrations.

• Electrical currents traveling through the air.

• Sound coming from outside.

Sound is a type of energy made by vibrations.

These vibrations create sound waves which move through different mediums, but it does not travel through:

• Vacuum

• Wood

• Seawater

• Air

Which of the following statements is NOT true?

• The ears of younger people can pick up sounds which older peoples’ ears cannot.

• The human ear can hear any sound that is produced.

• There are sounds which our ears cannot hear, but some animals can.

• Humans can't hear ultrasonic sounds. (sounds which are too high to hear)

Why does cupping your hands around your mouth when you shout make the sound travel further?

• The sound spreads out.

• Your voice gets louder.

• You are screaming.

• The sound energy is directed in one direction.