Fall 2018: Sound and Sound Waves

Which property of sound waves controls the volume (how loud or how soft the sound we hear)?

• Frequency
• Wavelength
• Amplitude
• Wave speed

What are objects that move with a speed equal to the speed of sound in air?

• Subsonic

• Transonic

• Supersonic

• Infrasonic

What are objects that move faster than the speed of sound in air?

• Subsonic

• Transonic

• Supersonic

• Infrasonic

Calculate the speed of sound in air at 40⁰ Celsius.

• 355 m/s
• 307 m/s
• 331 m/s
• 340 m/s

What is the reflection of sound waves?

• Reflection
• Echo
• Resonance
• Reverberation

Which part of the sound wave is the wave front?

• Compression
• Rarefaction
• Trough
• Crest

Through which medium will sound waves travel the slowest?

• Gases

• Liquids

• Solids

• Vacuum

What is a device that allows doctors to use high frequency sound waves to view internal organs and developing babies in the womb?

• Ultrasonic imager
• Doppler radar
• Infrasonic photography
• X-ray imaging

What is the typical frequency range of human hearing? (human audible range).

• 50-50,000 Hz

• 20-20,000 Hz

• 10-10,000 Hz

• 40-40,000 Hz

What happens if travelling waves passing through an object force that object vibrate at its fundamental frequency?

• Resonance
• Torsion
• Oscillation
• Fundamentality