Physics Yr 8 Review

True or False:

Ears are very sensitive organs that convert sound energy into electrical signals that travel to our brains.

• True

• False

It is another name for the Outer Ear. It is shaped so it collects sound energy.

• cochlea

• ossicles

• eardrum

• pinna

Three small bones that work together to pass the energy of the sound wave to the inner ear.

• cochlea

• eardrum

• ossicles

• eardrum

The structure of the ears is composed of three parts. What are they?

It is the unit of measure for the loudness of sound.

• decibel

• hertz

• newton

• pascal

Fill in the blank:

The loudness of a sound _______ as the distance to the source decreases.

• decreases

• increases

• stays the same

• none of these

Sounds with a frequency above the limit of human hearing. Over 20,000 hz.

• infrasound

• echo

• ultrasound

• megasound

A layer of tissue that separates the outer and inner parts of the ears.

• ossicles

• eardrum

• cochlea

• pinna

The reflection of sound waves.

• vibration

• echo

• radar

• hertz

Energy passed from particle to particle as they vibrate.

• light rays

• electricity

• gravity

• sound waves