Q3 W3 SCIENCE NATURE OF SOUND

What causes sound to be created?

• Light waves

• Vibrations of objects

• Heat transfer

• Magnetic fields

What type of wave is a sound wave?

• Transverse wave

• Electromagnetic wave

• Longitudinal wave

• Radio wave

What unit is used to measure the loudness of sound?

• Hertz

• Decibel

• Watt

• Pascal

What does the pitch of a sound depend on?

• Wavelength

• Amplitude

• Frequency

• Duration

What is the range of audible frequencies for the human ear?

• 0–15 Hz

• 16–20,000 Hz

• 25–30,000 Hz

• 50–100,000 Hz

Why can't sound travel in a vacuum?

• Lack of light

• Absence of particles to vibrate

• Low-temperature

• Weak gravitational pull

Which medium allows sound to travel the fastest?

• Gas

• Liquid

• Solid

• Vacuum

What property of sound is determined by its amplitude?

• Pitch

• Loudness

• Timbre

• Speed

What does the timbre of a sound refer to?

• Its volume

• Its uniqueness or quality

• Its pitch

• Its speed

What is the approximate noise level of normal conversation?

• 30 dB

• 50 dB

• 70 dB

• 90 dB