Sound

What is the highness or lowness of a sound?

• Intensity

• Vibration

• Quality

• Pitch

What produces sound?

• vibration of molecules

• striking the object

• creating electrical signals

• heating electricity

Sound waves travels fastest through _____.

• solid

• liquid

• gas

• plasma

You create vibrations in your _____ when you talk.

• mouth

• vocal cords

• lips

• stomach

Which of the following can cause noise pollution?

• recitation in the class

• whisper of a child to her mother

• drilling on the street

• laughter of a baby

Sounds that are lower than 20 Hz.

• Infrasonic

• Ultrasonic

• Sonic

• Supersonic

Tells us the number of waves that occurs per second.

• pitch

• amplitude

• wavelength

• frequency

Frequency is measured in _____.

• m

• dB

• Hz

• s

How does amplitude affect the loudness of sound?

• The higher is the amplitude, the lower the sound.

• The higher is the amplitude, the softer the sound.

• The higher is the amplitude, the louder the sound.

• The higher is the amplitude, the higher the sound.

Human ears can normally detect sounds that have frequencies between _______.

• 20 Hz - 200, 000 Hz

• 20 Hz - 20, 000 Hz

• 2 - 200 Hz

• 20 - 2, 000 Hz