Flashcards
key terms
Cards in this deck (30)
- 1transversethe oscillation producing the wave is perpendicular to the direction that the wave is travelling
- 2longitudinalThe oscillation that is producing the wave is parallel to the direction that the wave is travelling
- 3oscillationa regularly repeating motion about a central value
- 4frequency fthe number of whole cycles, vibrations or oscillations happening per second ( f=1/T )
- 5Period TThe time in seconds for one complete oscillation ( T = 1/f )
- 6displacementthe distance from the rest position
- 7amplitudethe maximum value of displacement
- 8phase differencethe difference in phase angle between two waves of identical frequency and wavelength
- 9antiphasehappens when two waves have a phase difference of 180 degrees
- 10interferencehappens when two waves meet
- 11interference patterna stationary pattern that arises when two waves interfere and superpose. The waves must be coherent
- 12coherentcoherent waves have the same frequency, wavelength and a constant phase difference.
- 13superpositionthe adding together of two, or more waves that arrive at the same place and interfere with each other
- 14path differencethe difference in length of paths that waves have travelled to a particular point, for example after a diffraction grating to a screen.
- 15photona fixed quantity of electromagnetic radiation
The energy E of the photon increases as the frequency increases E = hf - 16energy levelone of the fixed, allowed energies of an electron that is bound in an atom.
- 17ground statethe lowest energy state possible for value for an electron that is bound in an atom
- 18stationary waveswave motions that store energy and don't transfer energy to other locations.
- 19nodespoints along a stationary wave where the resulting amplitude is zero. (superposition has resulted in destructive interference)
- 20antinodespoints along a stationary wave where the resulting amplitude is a maximum. (superposition has resulted in constructive interference)
- 21resonancean object that can vibrate is forced to vibrate by another vibrating object
- 22forcing frequencyan external frequency that produces resonance
- 23refractive index nof a transparent material (medium) is the ratio of the speed of light in a vacuum to its speed in the medium ( n = c/v )
- 24incidencethe angle of the incoming ray (always measured form the normal)
- 25the normala dotted line drawn at right angles (perpendicular) to the boundary between two mediums
- 26refractionthe bending of when it travels from one medium into another
- 27critical angle Clight will be totally internally reflected at any angel greater than the critical angle
- 28Total Internal Reflection TIRAll light is reflected back into the glass. This happens when light is hitting a glass air boundary at an angle greater than the critical angle.
(so 2 essential conditions) - 29analogue signalsa signal that has a strength proportional to the quantity that it is representing
- 30digital signala signal that uses binary code (zeroes and ones) to represent a quantity
Information
- Description
- BTEC Level 3 Applied Science Flashcards on key terms, created by Di Munro on 25/04/2017.
- Created by
- Di Munro
- Views
- 17
- Rating