SOUND

Sound waves that are beyond the range of human ear are known as ----

• Infrasonic waves

• Ultrasonic waves

If you want to change the pitch of a sound, you have to change the ___

• speed

• amplitude

• volume

• frequency

This is what you get when sound waves are reflected, or bounce back, off of a hard surface.

• Amplitude

• Pitch

• Volume

• Echo

Bats use ________ to locate mosquitoes in the air

• solar

• ecology

• echolocation

• refraction

When a sound is louder what measurement gets bigger?

• Frequency

• Amplitude

• Wavelength

• Crest

As a sound source approaches and then moves past a stationary observer, the observer will hear

• a drop in pitch, then a rise in pitch

• a sudden drop in pitch

• a steady rise in pitch

• a rise in pitch, then a drop in pitch

Sound waves move more quickly through _________________ matter

• dense

• light

What unit is the intensity of sound measured in?

• decibels (dB)

• Hertz (Hz)

• meters per second (m/s)

• meters

A to and fro motion by an object is also called

• oscillatory motion

• periodic motion

• Cyclic motion

• none of these

1 hertz is equal to

• 1 vibration per minute

• 10 vibrations per minute

• 60 vibrations per minute

• 600 vibrations per minute