Waves and Sound
Oscilloscope
A graph of pressure versus time
Wave
A wiggle in space and time that transports energy, described by frequency, speed, amplitude, and wavelength
Vibration
A wiggle in time, described by frequency, how frequently vibratory motion occurs
Wave speed
Describes how fast a disturbance moves through a medium, related to the frequency and wavelength of a wave
Amplitude
Distance from the midpoint to crest or trough
Wavelength
Distance from the top of one crest to the top of the next crest, or distance between successive identical parts of the wave
Crests
High points of the wave
Frequency, Speed, Amplitude, and Wavelength
How is Wave described
Frequency
How is vibration described
1/20 second
If the frequency of a particular wave is 20 Hz, its period is. T = 1/f
Troughs
Low points of the wave
Speed of Sound
Sound travels at 340 m/s in air at 20*C
Wavelength (W)
The distance between adjacent peaks in the direction of travel for a transverse wave is its ________
A Vibration
The source of all waves
Perpendicular to the wave
The vibrations along a transverse wave move in a direction ______
Sound
Travels in longitudinal waves - vibrating compressions and rarefactions through air
Longitudinal wave, transverse wave
Two common types of waves that differ because of the direction in which the medium vibrates compared with the direction of travel
1 Hertz
Unit of vibrations in a given time, 1 vibration per second =
Higher frequency
____ means increased rate of energy transfer --- shorter wavelengths
Period
defined as the time it takes for a complete vibration, any unit of time, often the second
Radio Speaker
paper cone vibrates in rhythm with an electric signal Vibrations are displayed on an oscilloscope