Book 5B Ch3 Exploring sound

Match the words with the correct meaning.

• 反射

• noise

• 音調

• vibration

• 噪音

• pitch

• 液體

• liquid

• 振動

• reflection

Match the correct words with the correct meaning.

• 固體

• traffic

• 回音

• spongy

• 海綿似的

• produce

• 交通

• echo

• 產生

• solid

The longer a vibrating object, the ( ______ ) the pitch of sound it produces.

• higher

• louder

• weaker

• lower

The stronger the vibration of an object, the ( ______ ) the sound it produces.

• higher

• louder

• weaker

• lower

Sound is produced by the (________) of objects.

• transmission

• vibration

• reflection

• pitch

Echo may be produced by the (_______) of sound.

• transmission

• vibration

• reflection

• pitch

Spongy material can absorb sound and reduce echoes.

• True

• False

Sound can be transmitted through gases and liquids only.

• True

• False

Noise makes us feel (______).

• happy

• weaker

• comfortable

• uncomfortable

Traffic is not the most important source of noise pollution in Macao.

• True

• False