atoms and radioactive decay 4.0 / 5 based on 2 ratings ? PhysicsRadioactivityGCSEAQA Created by: mel1203Created on: 05-12-17 11:13 what is the structure of an alpha particle 2 protons and 2 neutron 1 of 44 what is an alpha particle stopped by paper 2 of 44 what is the charge of an alpha particle +2 3 of 44 what can an alpha particle rebound from foil 4 of 44 what is gamma radiation a wave 5 of 44 what is gamma radiation stopped by concrete 6 of 44 what can gamma radiation be used to do to medical or food sterilise it 7 of 44 is gamma radiation the most penetrating or ionising penetrating 8 of 44 what is radiation when an atom is unstable and releases radiation to become stable 9 of 44 what is the geiger tube used for to measure how radiactive something is 10 of 44 what is an unstable nuclei described as decaying when emmiting radiation 11 of 44 why are atoms radiactive an extra neutron 12 of 44 what do they all do break up molecules into smaller bits called ions 13 of 44 what is the structrue of beta radiation electron 14 of 44 what happens to the mass when beta is realeased to the atomic nr goes up by 1 15 of 44 what is beta stopped by thin metal/lead 16 of 44 how does an atom realease beta radiation a neutron changes to a proton which releases an elcetron 17 of 44 1st scientist to discover atom in 1808 dalton (ideas of atoms) 18 of 44 2sd scientist to discover atom in 1897 thomas (protons and electrons plum model) 19 of 44 3rd scientist to discover atom in 1911 ruthford (nucleus) 20 of 44 4th scientist to discover atom in 1913 bohr (electron shells 21 of 44 5th scientist to discover atom in 1926 schrodinger (shells orbit) 22 of 44 6th scientist to discover atom in 1932 chadwick (neutron) 23 of 44 electromagnetic meaning an electron jumping to a lower energy level 24 of 44 photon meaning a pocket of waves emitted in short bursts 25 of 44 what happened during the experiment to find out if alpha could probe an atom the nr of particles deflected per minute decreased as the angle of elevation increased 26 of 44 what is the radius of alpha particle 10 to the power of -15 27 of 44 what happenes when an alpha particle goes through an atom goes right through, bounces randomly, bounces from the nucleus 28 of 44 what is ionisation when a radioactive substance knocks out an electron out of an atom 29 of 44 what happens when an object is exposed to radiation irritated 30 of 44 what happenes when an object comes in contact with a radioactive substance contaminated 31 of 44 x-rays, fast moving proton or neutron couse ionisation 32 of 44 half life definition the activity of a radioactive source is the number of unstable atoms that decay per second 33 of 44 what is half life measured in becquerel (bq) 34 of 44 half life of a radioactive isotope is the time it takes: the mass to halve, for the count rate to halve 35 of 44 can you predict radioactive decay no 36 of 44 what is the count rate of n half lives count rate:2 to the power on n 37 of 44 what is the strong nuclei force protons and neutrons are held together by a strong attractive force 38 of 44 what stops the neutrons from moving away the electrostatic force 39 of 44 what is background radiation ionising radiation from radioactive substances such as randon gas 40 of 44 what is nuclear fission when a neutron is realeased to other atoms to make them unstable to make a chain reaction 41 of 44 what does the temp have to be for nuclear fission to happen high 42 of 44 what are used to keep control over the chain reaction boron rods 43 of 44 what is nuclear fusion when two atoms collide together to create one 44 of 44
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