Understanding Sound

What causes sound to be produced?

• Light reflection

• Wind speed

• Object vibrations

• Water movement

What are the two types of sound mentioned?

• Musical and non-musical

• Natural and artificial

• High and low

• Loud and soft

What type of sound is thunder considered?

• Artificial

• Natural

• Musical

• Digital

Which medium does sound travel faster in?

• Oil

• Vacuum

• Water

• Air

What is the effect of sound traveling in denser mediums?

• It changes pitch

• It travels slower

• It travels faster

• It does not travel

What unit is used to measure loudness?

• Watt

• Hertz

• Decibel

• Meter

At what decibel level can sounds become dangerous?

• Above 150 decibels

• Above 90 decibels

• Above 120 decibels

• Above 100 decibels

What happens to sound at 120 decibels?

• It can damage hearing

• It becomes ultrasonic

• It echoes indefinitely

• It becomes inaudible

What does pitch depend on?

• Wave height

• Wave speed

• Wave length

• Vibration frequency

What is the unit of frequency?

• Meter

• Decibel

• Second

• Hertz