BTEC Applied Science - Unit 1 – Physics 48 Questions with Answers,100% CORRECT

BTEC Applied Science - Unit 1 – Physics 48 Questions with Answers periodic time - CORRECT ANSWER the time taken (in seconds) for one complete cycle of a wave, vibration, or oscillation T = 1/f - CORRECT ANSWER time period, T (in seconds) and frequency, f (in hertz) wave speed - CORRECT ANSWER the distance in metres (m) travelled by a wave in one second (s) wavelength - CORRECT ANSWER the distance (in metres) between two nearest corresponding points on a wave, e.g. the distance between two peaks (crests) frequency - CORRECT ANSWER the number of waves produced in one second or the number of waves that pass a point each second amplitude - CORRECT ANSWER the maximum displacement of a wave from its undisturbed position oscillation - CORRECT ANSWER a regular repetitive motion, e.g. a weight on a spring bouncing up and down, or a pendulum swinging backwards and forwards transverse - CORRECT ANSWER a wave in which the direction of oscillations is perpendicular (at right angles) to the direction of the wave longitudinal - CORRECT ANSWER a wave in which the direction of oscillations is parallel to the direction of the wave displacement - CORRECT ANSWER the oscillating distance of a point on a wave from its undisturbed position coherence - CORRECT ANSWER two or more sources of waves that have the same frequency and are in phase or have a constant phase difference path difference - CORRECT ANSWER the difference between the distances that two waves have travelled when they meet at a point (usually measured as a multiple of wavelengths) phase difference - CORRECT ANSWER the amount by which one wave leads or lags (falls behind) another wave (usually measured in degrees, where 360⁰ corresponds to one full wave cycle) in phase - CORRECT ANSWER when two waves have zero phase difference antiphase (completely out of phase) - CORRECT ANSWER when two waves have a phase difference of 180⁰ (half a wave cycle) superposition - CORRECT ANSWER when two or more waves combine; their displacements are added together (displacements can cancel each other out) constructive interference - CORRECT ANSWER when the superposition of two waves cause the displacement to increase (greater amplitude) destructive interference - CORRECT ANSWER when the superposition of two waves cause the displacement to decrease (smaller amplitude, even zero) diffraction grating - CORRECT ANSWER an optical device that has a periodic structure of many slits which splits and diffracts light into several beams. Different frequencies (wavelengths) of light diffract by different amounts (atomic) emission spectra - CORRECT ANSWER the range of frequencies of light emitted by an element because of electrons moving between energy levels within atoms identifying gases - CORRECT ANSWER each element has a unique emission spectra and so by analysing the light given off all the elements can be identified wave equation - CORRECT ANSWER v is the wave speed (velocity) in metres per second (m/s), f is frequency in hertz (Hz), and λ is wavelength in metres (m) stationary (standing) wave - CORRECT ANSWER the superposition of a wave and its reflection to form a steady interference pattern of nodes and antinodes node - CORRECT ANSWER points on a stationary wave with zero amplitude (two nodes are half a wavelength apart) antinode - CORRECT ANSWER points on a stationary wave with maximum amplitude (two antinodes are half a wavelength apart) resonance - CORRECT ANSWER when a system is periodically forced at a frequency that causes a massive increase in amplitude (e.g. when you push someone on a swing) speed of wave on a string - CORRECT ANSWER v is the wave speed (velocity) in metres per second (m/s), T is the tension in the string in newtons (N), and