# Shared Flashcard Set

## Details

IB Physics SL Topic 4
Assessment Statements
8
Physics
05/10/2011

Term
 4.1.2 Define the terms displacement,amplitude, frequency, period and phasedifference.
Definition
 displacement: the instantaneous distance of a moving object from its mean position in a specified direction. frequency: the number of oscillations completed per unit timeperiod: the time taken for one oscillationphase difference: a measure of how in step different particles are
Term
 4.1.3 Define simple harmonic motion (SHM)and state the defining equation asa = −w^2x .
Definition
 The motion that takes place when acceleration a is always directed towards and proportional to its displacement from a fixed point.
Term
 4.3.1 State what is meant by damping.
Definition
 It is sufficient for students to know that damping involves a force that is always in the opposite direction to the direction of motion of the oscillating particle and that the force is a dissipative force.
Term
 4.3.3 State what is meant by naturalfrequency of vibration and forcedoscillations.
Definition
 a system oscillates at its natural frequency of vibration when it is temporarily displaced from its equilibrium position and released.Forced oscillations occur when the system is subject to an external force that varies with the chosen frequency.
Term
 4.3.5 State what is meant by resonance.
Definition
 When a system is forced to oscillate at its natural frequency.
Term
 4.4.2 State that progressive (travelling) waves transfer energy.
Definition
 Students should understand that there is no net motion of the medium through which the wave travels.
Term
 4.4.6 Define the terms displacement,amplitude, frequency, period, wavelength, wave speed and intensity.
Definition
 disp: the change that has taken place as a result of a wave passing a particular point.amplitude: the maximum displacement from the mean positionfrequency: the amount of oscillations per unit timeperiod: the time taken for one complete oscillationwavelength: the shortest distance along the wave between two points that are in phase.wave speed: the speed at which wavefronts pass a stationary observerintensity: power per unit area that is received by the observerINTENSITY IS PROPORTIONAL TO AMPLITUDE^2
Term
 4.4.9 State that all electromagneticwaves travel with the same speedin free space, and recall the ordersof magnitude of the wavelengthsof the principal radiations in theelectromagnetic spectrum.
Definition
 visible light: 10-7 – 10-6
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