Waves
The highest point on a sine wave is called this
Crest
What units are used to measure perceived loudness?
Decibels
Does the Doppler effect occur with all waves or only sound waves?
All waves
Define "fundamental frequency"
The lowest possible frequency of a standing wave for a particular system (string, pipe, etc.)
The region of a sound wave in which air particles are pushed very close together is called a ___________
Compression
Sound waves are ___________ waves
Longitudinal
Intensity is the rate at which ___________ flows through a unit area perpendicular to the direction of wave motion
Energy
If the length of a string is doubled, how does the wavelength of the fundamental frequency change?
The wavelength of the fundamental frequency is doubled
State the first three harmonics of a string fixed at both ends given the fundamental frequency 50 Hz
1st harmonic: 50 Hz
2nd harmonic: 100 Hz
3rd harmonic: 150 Hz
Generally, sound travels fastest through this state of matter
Solids
A sine waveform can be used to represent a sound wave. What do the crests on this waveform represent?
Compressions
What units are used to measure intensity?
W/m^2 (watts per square meter)
When the frequency of a sound wave increases, the perceived pitch of the sound __________.
Increases
If a point on a string at an antinode moves a total vertical distance of 10 cm during one complete cycle, what is the amplitude of the standing wave?
2.5 cm
What are the only 3 states Mr. Diehl has not traveled to?
Hawaii, Alaska, North Dakota
A sine waveform can be used to represent a sound wave. What do the troughs on this waveform represent?
Rarefactions
The relationship between loudness and intensity is ______________.
Logarithmic
As an ambulance with a siren drives away from you, the perceived pitch of its siren _____________
Decreases
State the first three harmonics in a pipe with two open ends given the fundamental frequency 200 Hz.
1st harmonic: 200 Hz
2nd harmonic: 400 Hz
3rd harmonic: 600 Hz
One stereo loudspeaker produces a sound with a wavelength of 0.68 meters while the other speaker produces sound with a wavelength of 0.65 m. What would be the resulting beat frequency?
23 Hz
Mac and Tosh stand 5 meters apart and demonstrate the motion of a transverse wave on a slinky. The wave can be described as having a vertical distance of .24 m from a trough to a crest, a frequency of 2.1 Hz, and a horizontal distance of .42 m from a crest to the nearest trough. Determine the amplitude, wavelength and period of the wave.
A = .12m, Wavelength = .48m, T = .48s
If a sound's loudness increases by 10 dB, how much has the sound's intensity increased?
The intensity has been multiplied by 10
If the length of a string is doubled, how does the fundamental frequency of the string change?
The fundamental frequency of the string is halved
If the fundamental frequency of the clarinet, which acts a closed ended pipe, is 200 Hz. What is the effective length of the clarinet?
About 21 cm
The hull number of the original starship USS Enterprise
NCC-1701