Conservation of Energy
What is the law of conservation of energy?
Energy cannot be created or destroyed; it can only be transferred or transformed.
Matter exists in these three common states.
What are solids, liquids, and gases?
This part vibrates first when someone speaks into the cup.
The air inside the cup
The highest point in a wave
The crest
The unit used to measure frequency.
Hertz (Hz)
Hot soup warming a metal spoon is an example of this.
What is energy transfer?
In this state, particles are close together but can flow past one another.
Liquid
For a fair test, each material should be tested this many times.
Three times
Regions where particles are spread farther apart.
Rarefactions
The number of complete cycles that pass a point each second.
The frequency
What is wasted energy?
Energy transferred to the surroundings that does not help achieve the purpose.
Even in solids, particles do this.
Vibrate
Sound is usually fastest in this state of matter.
Solid materials
The undisturbed middle position of a wave.
Rest position
Larger amplitudes are usually associated with this.
Will sound louder
A speaker changing electrical energy into sound energy is an example of this.
Energy transformation
This contains no particles to transfer sound energy.
In a vacuum
Warm air carries sound ______ than cold air.
faster
The distance between matching points on adjacent waves, such as crest to crest.
A wavelength
A longer air column generally produces this type of pitch.
Lower pitch
In a Sankey diagram with 70 J useful and 30 J wasted, the total input must be this.
Input is 100 J
Regions where particles are close together during a sound wave.
Compressions
The formula used to calculate sound reduction.
sound reduction = baseline mean − insulated mean
In these waves, vibrations are parallel to the direction of energy transfer.
Longitudinal waves
If frequency stays the same but amplitude decreases, this changes.
The loudness of the sound