UNIT 1 PHYSICS KEY WORDS (BTEC APPLIED SCIENCE LEVEL 3) QUESTIONS WITH CORRECT ANSWERS

Oscillation CORRECT ANSWER A regular repeating motion about a central value Antinode CORRECT ANSWER points of maximum amplitude that occur halfway between each pair of nodes. Stationary Waves CORRECT ANSWER wave motions that store energy rather than transferring energy to other locations Radian CORRECT ANSWER a unit of angle measure based on arc length Superimpose/superposition CORRECT ANSWER the adding together of wave displacements that occur when waves from two or more separate sources overlap at any given location. Energy of a photon equation CORRECT ANSWER E=hf Refractive Index CORRECT ANSWER of a transparent medium is the ratio of speed of light in vacuum to the speed of light in the medium. First Harmonic CORRECT ANSWER Pattern of stationary waves on a string when it vibrates at its lowest possible frequency Displacement CORRECT ANSWER how far the quantity that is in an oscillation has moved from its mean value at any given time Phase Difference CORRECT ANSWER the difference in phase angle between two waves of the same frequency and wavelength, where 360(degrees) represents a whole cycle of the waveform. Path Difference CORRECT ANSWER the difference in length between two rays, one from a particular grating gap to a given path in space and the ray from the next door gap to the same point. Node CORRECT ANSWER points along a wave where the displacement is at a minimum. Resonance CORRECT ANSWER the storing of energy in oscillation or a stationary wave, the energy coming from an external source of appropriately matched frequency.