BTEC APPLIED SCIENCE - UNIT 1 – PHYSICS EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE

BTEC APPLIED SCIENCE - UNIT 1 – PHYSICS EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE Practice questions for this set Terms in this set (48) periodic time the time taken (in seconds) for one complete cycle of a wave, vibration, or oscillation T = 1/f time period, T (in seconds) and frequency, f (in hertz) wave speed the distance in metres (m) travelled by a wave in one second (s) wavelength the distance (in metres) between two nearest corresponding points on a wave, e.g. the distance between two peaks (crests) frequency the number of waves produced in one second or the number of waves that pass a point each second amplitude the maximum displacement of a wave from its undisturbed position oscillation a regular repetitive motion, e.g. a weight on a spring bouncing up and down, or a pendulum swinging backwards and forwards transverse a wave in which the direction of oscillations is perpendicular (at right angles) to the direction of the wave longitudinal a wave in which the direction of oscillations is parallel to the direction of the wave displacement the oscillating distance of a point on a wave from its undisturbed position coherence two or more sources of waves that have the same frequency and are in phase or have a constant phase difference path difference 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 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 when two waves have zero phase difference antiphase (completely out of phase) when two waves have a phase difference of 180⁰ (half a wave cycle) superposition when two or more waves combine; their displacements are added together (displacements can cancel each other out) constructive interference when the superposition of two waves cause the displacement to increase (greater amplitude) destructive interference when the superposition of two waves cause the displacement to decrease (smaller amplitude, even zero) diffraction grating 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 the range of frequencies of light emitted by an element because of electrons moving between energy levels within atoms identifying gases each element has a unique emission spectra and so by analysing the light given off all the elements can be identified wave equation 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)