P5/P6 Key Facts 0.0 / 5 ? PhysicsRadioactivityWavesWaves and SoundGCSEOCR Created by: Mayah7113Created on: 02-10-19 18:56 What type of wave are sound and water waves? mechanical waves 1 of 30 Amplitude the distance from the middle to the bottom or the top of a wave 2 of 30 Wavelength the distance from one point on a wave to the same point on the next wave 3 of 30 Frequency the number of waves per second 4 of 30 Time period the time for one wave to pass a given point 5 of 30 Formula for wave velocity wave velocity(m/s) = frequency(Hz) x wavelength(m) 6 of 30 A ripple tank can be used for... measuring the velocity of sound waves 7 of 30 Example of a way to measure the velocity of sound waves timing how long it takes to hear an echo 8 of 30 Example of longitudinal wave sound wave 9 of 30 What way do particles move in relation to a longitudinal wave? the particles vibrate (oscillate) in the same direction as the wave 10 of 30 Example of transverse wave electromagnetic wave 11 of 30 What way do particles move in relation to a transverse wave? the particles vibrate (oscillate) at right angles to the wave 12 of 30 Does a longitudinal wave slow when it travels through a vacuum? no, it travels at the same speed 13 of 30 An aerial a device used for detecting electromagnetic waves 14 of 30 Waves for communication microwaves, radio waves, infrared and visible light 15 of 30 Rays for damaging/killing cells ultraviolet, x-rays and gamma rays 16 of 30 How is ultraviolet used? forensic scientists use ultraviolet too detect body fluids at crime scenes 17 of 30 Protons, electrons and neutrons are... subatomic particles 18 of 30 Isotopes atoms of an element with the same number of protons but a different number of neutrons 19 of 30 What are stable atoms? stable atoms are atoms that do not break down (decay) 20 of 30 How are the nuclei of unstable atoms different? the nuclei of unstable atoms emit radiation 21 of 30 Alpha particles are... the nuclei of helium atoms 22 of 30 A beta particle is... a fast moving electron 23 of 30 Gamma is... an electromagnetic wave 24 of 30 How can alpha decay be stopped? alpha decay can be stopped with paper or skin 25 of 30 How can beta decay be stopped? beta decay can be stopped with aluminium 26 of 30 How can gamma be stopped? gamma is the most penetrating and can be stopped by a few centimetres of lead 27 of 30 What is ionising radiation? it can remove electrons from atoms to produce positively charged ions 28 of 30 A half-life the time taken for the nuclei of half of the atoms in a radioactive material to decay 29 of 30 A photon a packet of electromagnetic radiation 30 of 30
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