When you pluck the string of a guitar, the sound is produced by

• metal on guitar

• wood of guitar

• vibrations of string

What allows two separated students ten feet away to listen when the other speaks?

• compressions and rarefactions of air

• electromagnetic waves

• seismic waves

Sound waves cause the eardrum

• grow larger

• become infected

• to vibrate

Which of the following has the greatest effect on the speed at which sound travels through a gas?

• frequency

• amplitude

• proximity of subatomic particles

A doorbell circuit converts electrical energy into mechanical energy. The mechanical energy is in the form of vibrations that ultimately produce

• EM waves

• Sound waves

• Thermal Energy

Elizabeth uses a specific type of whistle to call her dogs. The noise made by the whistle is heard by the dogs but cannot be heard by the human ear. Which statement BEST describes why humans cannot hear the sound made by the whistle?

• The speed of sound is too fast

• The frequency of sound is too high

• The amplitude is too low.

Which wave has the longest wavelength.

• 1

• 2

• 3

• 4

If the loudness of a sound increases , what increases on the sound wave?

• wavelength

• pitch

• amplitude

• If the loudness of a sound increases ,what increases on the sound wave?

Which type of energy requires no matter to travel?

• Earth Quake

• Sound

• EM waves

What is the speed of every type of EM wave?

• 1 meter per second

• 300,000,000 meters per second

• 1,000 meters per second