Primary 3 General Studies Unit 2

Sound is created when something vibrates.

Sound travels through the air in waves that push air molecules.

A thin membrane in the ear that vibrates when sound waves hit it.

Sound waves enter the ear, causing the eardrum and tiny bones to vibrate. The brain interprets these vibrations as sound.

The part of the ear that collects sound waves.

The part of the ear containing tiny bones that amplify vibrations from the eardrum.

The part of the ear containing the nerves that send signals to the brain.

Sound travels fastest in solids, then liquids, and slowest in gases due to the closeness of the molecules.

Washing ears regularly with clean water is a way to maintain healthy ears.

Putting sharp objects in your ears can harm them; this is an example of unsafe ear care.

The unit used to measure the loudness of a sound.

Extremely loud sounds can permanently damage your hearing.

Wearing ear protectors in noisy environments protects hearing.

Sound is used in telecommunications to send information and messages.

Musical instruments produce sounds through various methods.

Ears can distinguish similar sounds (like different cries or meows) and identify sound source direction.

As sound waves spread, the volume gets softer.

Sound travels faster with closer molecules.

Hearing problems can arise from birth, old age, or ear damage (loud noises).

Cover ears during loud noises to prevent damage.

Wash ears with clean water, dry well, and see a doctor if needed.

Difficulty hearing, diagnosed by difficulty hearing conversations.

Ear protectors or covering ears, required in noisy environments.