Integrated Physics and Chemistry Quiz 2: Sound

Sound is a ____________ wave

- longitudinal - pressure

Sound travels fastest in _________

solids

The decibel scale measures =

the loudness of a sound

How long would it take for a sound impulse to travel through an aluminum rod 1,500 meters long?

0.29 sec

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins.

0.5 sec

Two tuning forks are played at the same time. One has a frequency of 490 Hz and the other is 488 Hz. How many beats per second are heard?

2

If the second harmonic of a certain string is 42 Hz, what is the fundamental frequency of the string?

21 Hz

A galloping pony speeds past you at 5 m/s. The frequency of the sound produced by the hooves on the dirt is 221 Hz. Assume the speed of sound to be 342 m/s. What is the observed frequency of the hooves after the pony has passed your position?

218 Hz

The siren from a small town fire station is heard at a location 3 kilometers away. If the air temperature is 20°C, at what velocity did the sound travel?

343 m/s

When a 440-Hz tuning fork and a piano key are struck together, five beats are heard. If the pitch of the note on the piano is lower than the tuning fork, what is the frequency of the note?

435 Hz

What corresponds to a supersonic speed?

Mach 1.5

The loudness of a sound is related to the ____________ of the sound wave.

amplitude

When two notes are played simultaneously, creating a discordant sound, it is called =

dissonance

Which part of the ear picks up vibrations from the atmosphere?

eardrum

Bats use ultrasound in echolocation. This sound is characterized by =

high frequency

Increasing the pitch of a note on the piano means you make the note _____________

higher

A sound-producing object is moving away from an observer. The sound the observer hears will have a frequency __________ that actually being produced by the object.

lower than

Sound waves have two parts. The part of the wave where the particles of the medium are spread apart is called the ______________

rarefaction

A shock wave first forms when an object __________ the speed of sound.

reaches