Sources of Sound

Sources of Sound

What is sound?

Sound is made up of vibrations, or sound waves, that we can hear. These sound waves are formed by objects vibrating (shaking back and forth).

Multiple Choice

TRUE or FALSE

Sound is made up of waves.

• True

• False

The vibrations travel through the air or another medium (solid, liquid or gas) to the ear.

Multiple Choice

TRUE or FALSE

Sound can only travel through soilds.

• True

• False

The stronger the vibrations, the louder the sound. Weak vibrations make soft sounds.

Multiple Choice

Which of the following is true?

• Weak vibrations produce loud sound.

• Strong vibrations produce soft sound.

• Sound can travel in different medium.

• Sound is caused by light.

The sound an object makes changes depending on how fast it is vibrating. When an object vibrates quickly, high-pitched sounds are heard.

Low-pitched sounds come from things that vibrate more slowly.

Multiple Choice

TRUE or FALSE

Sound can be high-pitched or low-pitched.

• True

• False

Multiple Choice

TRUE or FALSE

High-pitched sounds come from slow vibrating things.

• True

• False

Humans can hear sounds of different pitches, but there are sounds that they cannot hear.

Multiple Choice

TRUE or FALSE

The human ear can hear all sounds.

• True

• False

Humans cannot hear very low-pitched noises, known as infrasound. Some animals like elephants communicate through this sound.

Humans cannot hear very high-pitched sounds called ultrasound. Dolphins are ultrasonic animals.

Multiple Choice

TRUE or FALSE

Very low-pitched sounds are called ultrasound.

• True

• False

Multiple Select

Choose all animals that can hear infrasound.