Understanding Sound and Its Loudness

What is sound primarily a measurement of?

• Color

• Light waves

• Vibrations

• Temperature

Which of the following is considered a nearly silent sound?

• A motorcycle

• A vacuum cleaner

• A dog's bark

• An eyelash flutter

Which of these sounds is louder than a babbling brook but not the loudest?

• A baby's breath

• An eyelash flutter

• A vacuum cleaner

• A dry leaf falling

What was the loudest sound recorded in human history?

• A rock concert

• A jet engine

• The Krakatoa eruption

• A fireworks display

How far away could the sound of the Krakatoa eruption be heard?

• 500 miles

• 2,000 miles

• 3,000 miles

• 1,000 miles