2.1

Pressure molecules are always compared to a referent pressure called _____

atmospheric pressure

Fewer collisions means

lower pressure

A high amount of elasticity means the material is _______

not stiff/very compliant

A low amount of elasticity means the material is _______

stiff/not compliant

Do molecules have mass?

yes

inertia

the natural tendency of objects in motion to stay in motion, and objects at rest to stay at rest

Higher mass means _______ inertia

higher

Sound is the propagation of a _____ through a medium

vibration

A wave is an oscillation that _______ energy and momentum

transfers

momentum formula

mass x velocity

particle velocity

how fast the particles are moving and in what direction

Newton’s Third Law of Motion implies that

the individual molecules of the medium do not travel. The molecules pass their energy from one molecule to the next

Air molecules cannot stop because of _____, but they will always try to return to their original position due to _______

inertia; elastic forces

What is a property of longitudinal waves as soundwaves?

air molecules next to those initially moved are moved back and forth through stages of condensation and rarefaction

During compression, the pressure is _____ and the density is ______

increased; high

During rarefaction, the pressure is ______ and the density is ______

decreased; low

What is a property of transverse waves as soundwaves?

air molecules next to those initially moved are moved up and down through stages of condensation and rarefaction

What are some examples of transverse waves?

water ripple, string wave, jump rope, visible light, x-rays

What is sound propagation?

the process by which a vibrating source causes disturbances in a medium, creating pressure and density variations that travel as waves from one particle to the next

period

the time for one cycle of motion

Frequency

the number of cycles that occur in one second

Period and frequency have a _____ relationship

inverse

wavelength

the distance between two successive compressions or two successive rarefactions in a sound wave

What is the value of the speed of sound ( c )

33,600 cm/s

Frequency and wavelength are _____ related

inversely

sound diffraction

the way that sound waves bend around obstacles or spread out after passing through openings

Sound diffraction depends on the _______ of the wave

wavelength

If the opening size is greater than the wavelength, there is _____ diffraction

less

If the wavelength is similar to the barrier size, there will be ____ diffraction

more

Sounds with ____ wavelengths tend to have wide diffraction

long

Sounds with _____ wavelengths tend to have narrow/less diffraction

short

sound interference

when two (or more) waves are in a space at the same time, the peaks and valleys add together to give a new “combined” wave