Physics Sound Test

The wavelength of the fundamental frequency of a vibrating string of length L is

2L

High pressure, low pressure

Compression, rarefaction

Intensity is equal to

Power / 4pir^2

If you are on a train, how will the pitch of the train's whistle sound to you as the train moves?

The pitch will not change (you are inside the train)

The Doppler effect occurs with

all waves

The property of sound called intensity is proportional to the rate at which energy flows through

an area perpendicular to the direction

beats

at fixed points there is an alternation in loudness

Which of the following is the region of a sound wave in which the density and pressure are greater than normal?

compression

Audible sound waves

frequencies between 20 and 20 000 Hz

Pitch depends on the ______ of a sound wave

frequency

The quality of a musical tone of a certain pitch results from a combination of

harmonics

A train moves down the track toward an observer. The sound from the train, as heard by the observer is ______ the sound heard by a passenger on the train

higher in pitch than

less than 20 Hz

infrasonic

Sound waves are

longitudinal waves

speed of sound depends on the

medium

The distance between wave fronts of plane waves corresponds to ______ of a sound wave

one wavelength

The highness or lowness of a sound is perceived as

pitch

At a large distance from a sound source, spherical wave fronts are viewed as

plane waves

The trough of the sine curve used to represent a sound wave corresponds to

rarefaction

When the frequency of a force applied to a system matches the natural frequency of vibration of the system, ________ occurs

resonance

In general, sound travels faster through

solids than gases

For a standing wave in an air column in a pipe that is open at both ends, there must be at least

two antinodes and one node

more than 20 000 Hz

ultrasonic

Fundamental frequency is equal to

velocity / 2L