Card Set Information
1st year Physics; Semester 1
The direction of oscillation of a particle is perpendicular to the direction of propagation of the wave.
Eg. electromagnetic waves such light
The direction of oscillation of a particle is the same as the direction of propagation of the wave.
Eg. Sound waves
The principal of Linear Suspension
When two or more waves are present simultaneously at the same place the resultant disturbance is the sum of of the disturbances from the individual waves
When two periodic travelling waves of the same frequency and amplitude, moving in opposite directions meet, they interfere with each other and result in a "standing wave"
Regions of higher molecular density - air pressure less than atmospheric
Regions of lower molecular density - air pressure less than atmospheric
The Doppler Effect
The change in sound frequency experienced by a listener when there is a non-zero relative velocity between the source of sound and the listener
The maximum distance travelled by a particle in the wave medium, measured with respect to the undisturbed position
Beats occur when there are two waves present and there is a small difference in frequency between them.
The Beat Frequency is:
The absolute value of the difference in frequency of the two waves |f
The horizontal distance between two crests on the wave (or two troughs)
The rate at which the wave is travelling.
or Hertz (Hz)
1Hz = 1s
The time required for one complete "up-down" oscillation cycle.
Y = A Sin (2 pi f t ± 2pix/λ)
The force (in Newtons) between two points charges q
, separated by distance, r, and in a medium with permittivity ε
can be expressed as: F= K |q
the electric potential V at given point is electric potential energy EPE of a small test charge q
situated at that point, divided by the charge itself V=EPE/q
Unit: Joule/Coulomb + Volt (V)
Electric Potential Energy (Wikipedia)
Potential energy that results from conservative Coulombs forces and is associated with the configuration of a particular set of point charges within a defined system
A substance which is a poor conductor of electricity but an efficient supporter of electrostatic fields.
The role of the dielectric is to alter the electric field line between the plates and to prevent movement of charge between the plates
The flow of positive charge
(from the positive terminal to the negative terminal)
An electric current that reverses its direction many times a second at regular intervals
A measure of the resisting power of a specified material to the flow of an electric current
Around any closed-loop circuit, the sum of the potential drops equals the sum of the potential rises