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Physics: Waves and Quantum Definitions
Terms in this set (33)
The distance any part of the wave has moved from its mean position (it can be positive or negative)
Is the maximum displacement from the mean or rest position.
Distance between two adjacent points on a wave that are in phase with each other OR The distance travelled by a wave during one complete oscillation
Time taken for one complete cycle/wave/vibration/oscillation
Oscillations perpendicular to wave direction
Oscillations parallel to wave direction
Number of waves/vibrations/oscillations per unit time
Speed of a wave
Distance traveled by the wave per unit time
Spreading out of waves when they meet an aperture or obstacle
Refractive index of a material = speed of light in a vacuum / speed of light in the material
n sin θ = constant, at a boundary between different media (terms need to be defined)
The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
Principle of superposition of waves
When two waves meet (interfere) at a point the resultant displacement is the sum of individual displacements.
The superposition of two coherent waves (that results in a new wave pattern)
Constant phase difference
The amount by which the path traveled by one wave is longer than the path traveled by the other wave (usually measured in wavelengths)
Difference in degrees/radians/angle between points on the same wave or (similar) points on two waves.
Waves meet in phase producing a resultant of maximum amplitude
Waves meet in anti-phase producing a resultant of minimum amplitude
The distance between adjacent maxima in an interference pattern
A wave in which energy is transferred from one place to another via oscillations or vibrations.
A wave in which energy is stored. Consists of nodes and antinodes.
A node is a point of zero amplitude on a stationary wave
A point of maximum amplitude on a standing wave
Fundamental mode of vibration (1st harmonic)
The lowest frequency in a harmonic series where a stationary waves forms.
Whole number multiples of the fundamental frequency of a stationary wave.
Plane polarised waves
Plane polarised waves are transverse waves that oscillate in one direction only (or one plane only) and 90o to the direction of energy propagation
A quantum of energy of electromagnetic radiation
The emission, or ejection, of electrons from the surface of a metal in response to incident light of high enough energy
Minimum energy required to release an electron from the surface of the metal
The minimum frequency of EM radiation for emission of electrons
The electron volt
1 eV is the energy (transformed by an) electron traveling through a p.d. of 1V
The exhibition of both wavelike and particlelike properties by a single entity. E.g. electrons undergo diffraction and can interfere with each other as waves, but they also act as pointlike masses and electric charges.
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