Waves/ Sound Concepts
Which faze of matter transmits energy fastest? Rate them from fastest to slowest. Why?
Solid> Liquid> Gas
Because the particles are closer together.
What is the mathematical relationship between frequency and period?
They are reciprocals.
F=1/T
T=1/F
Torque
T=I(alpha)
T=Fr
Law of COAM
Rotational momentum is always conserved in a closed system.
Hoops (rolling)
mr^2
What is the principle of superposition?
When a reflected wave and outgoing wave overlap, they are both trying to pull the medium in their direction, so the result is the algebraic sum of their amplitudes.
What is the wave equation?
V=F(wavelength)
(m/s)
Moment Of Inertia
I=mr^2
Torque
The measure of how much force acting on an object causes the object to rotate.
Point Mass
mr^2
What is the Doppler Effect?
The apparent change in frequency due to the relative motion between the source and the listener.
(Dropping a stone in water/ firetruck sirens).
Fundamental Frequency of an open/open or closed/closed system.
Fn=nv/2L
(1/2 wavelength).
Angular Momentum
Law of COE
Rotational energy is always consreved in a closed system
Hollow Sphere
2/3mr^2
In an open/open or closed/ closed system, where are the nodes and antinodes periodically placed?
Antinodes- always at the start and end
Nodes- according to the waves nth harmonics
Fundamental Frequency of a closed/ open system.
Fn=nv/4L
(1/4 wavelength).
Solid Sphere Rotational Inertia
2/3mr^2
Moment of Inertia.
An objects tendency to keep doing what it is doing.
Disk
1/2mr^2
What is acoustic levitation an example of?
It demonstrates superposition where the frequencies overlap a neutral point is created at the point of deconstructed interference.
Energy equation
E=1/2kA^2
(a waves energy is proportional to it's amplitude squared).
Angular Acceleration
Alpha= change in omega/ time
Change in angular momentum.
Impulse.
Hoop (rotating)
1/2mr^2