SIE 4 Sound

Sounds are made when things or air…

• move

• travels

• vibrate

• pass through

What are vibrating when this instrument making sound?

• voice box

• iron plate

• wings

• iron tube

Illustration below shows we cannot hear the sound in ...

• solid

• liquid

• air

• vacuum

The following choices are belongs to loud sound.

Loud sound produced by large vibrations.

Tick the loud sound.

You can tick more than 1.

• thunder

• leaves falling from trees

• plane take off

• whisper of two humans

Sound level-meter is the apparatus that can measure sound.

True or False?

• true

• false

Sound levels are measured in the unit…

• newton

• lux

• decibel

• kilometer

Which of the sound that are safe for our ears?

• rocket taking off

• train moving

• siren sounding

• people talking

Open your book page 142.

Please tick the right properties of cinema must have to absorb the sound.

Tick more than 1.

• curtains

• carpets

• soft cushion

• plastic chairs

• padded walls

Which apparatus that can protect our ears and keep out noise?

Tick more than 1.

• headphone

• earplugs

• earphone

• earmuffs

A high-pitched sound is made when a thing or material vibrates quickly.

True or False?

• True

• False