Sound Flashcards
Medium
A substance that all sound waves travel through and need to have in order to make
Longitudinal wave
A fixed point will move parallel with the wave motion
Slinky
What are compressions of a longitudinal wave?
An area of high molecular density and pressure
when the slinky is close together
What are refractions in a longitudinal wave?
An area of low molecular density and pressure
when the slinky is far apart
Transverse wave
A fixed point will move perpendicular with the wave motion
What are the antinodes of a transverse wave?
The areas of maximum amplitude.
The hills of the wave
What are the nodes of the transverse wave?
Areas of zero amplitude
where the wave hits the median
A soundwave is a ______
Pressure variation that is transmitted through matter. There is a vibrating source.
The vibrating source _______
Creates different amounts of air pressure. This creates a oscillations and pressure.
The motion of the air molecules is parallel to the direction of the motion of the wave is called a ______ wave
Longitudinal
Reflection
A.k.a. echoes
Echolocation is used by bats and sonar
Refraction
Moving into different matter
Sound travels faster in liquid and fastest in solid.
This does not move through a vacuum because there is no medium or matter inside the vacuum.
Diffraction
Sound bends outwards after passing through narrow openings.
Many musical instruments used this property of sound waves.
Amplitude
The measure of the by the variation in pressure along the wave
(How high or low that the wave goes)
What does the loudness of sound depend on?
Amplitude
Pressure variations
This is what your ears detect. Your brain interprets these variations because that the ear can detect such a wide range of pressure variations
The amplitudes of sound are measured on the logarithmic scale. This is called _____ and is measured in ______.
Sound level
Decibels (db)
The most faintly heard sound is at _________.
2*10^-5 Pa (pascals)
A tuning fork vibrates to produce simple what?
Oscillations
Uses principles of ______ to create waves of many different ______
Superposition
Frequencies
Musical instruments in the human voice uses this.
Timbre
Tone quality
The complex patterns of wave superposition give each voice and instrument the distinct sound.
The “pitch” deals with _______
Frequency of the vibrations. Not how loud something is
Pitches are given names on the ________
Musical scale
The C-note has a frequency of?
262 Hz
