G9-SCI-L11 Sound

What is sound?

• A form of energy that produces a sensation of hearing
• A form of light energy
• A form of mechanical energy
• A form of heat energy

How is sound produced?

• By vibrating objects
• By electromagnetic waves
• By chemical reactions
• By gravitational force

What is the medium through which sound travels?

• Solid
• Liquid
• Gas
• All of the above

What is the difference between compressions and rarefactions in a sound wave?

• Compressions are regions of high pressure and rarefactions are regions of low pressure
• Compressions are regions of low pressure and rarefactions are regions of high pressure
• Compressions are regions of high density and rarefactions are regions of low density
• Compressions are regions of low density and rarefactions are regions of high density

What is the speed of sound in air?

• 331 m/s
• 344 m/s
• 346 m/s
• 350 m/s

What is reverberation?

• The persistence of sound in a closed space due to repeated reflections
• The reflection of sound waves from a distant object
• The scattering of sound waves in all directions
• The absorption of sound waves by a medium

What is the audiblerange of sound for human beings?

• 20 Hz to 20 kHz
• 10 Hz to 100 kHz
• 1 Hz to 1 MHz
• 100 Hz to 1 GHz

What are infrasonic sound waves?

• Sound waves with frequencies below 20 Hz
• Sound waves with frequencies above 20 kHz
• Sound waves with frequencies between 20 Hz and 20 kHz
• Sound waves with frequencies above 1 MHz

What is the purpose of an ultrasound scanner?

• To clean hard-to-reach parts
• To detect defects in metal blocks
• To produce images of internal organs
• To measure the intensity of sound

What is the frequency range of ultrasound?

• Below 20 Hz
• 20 Hz to 20 kHz
• Above 20 kHz
• 1 Hz to 1 MHz