In the nucleus of an atom the strong force is a relatively The strong force acts between 50 69 1 2 3 4 In class activities A short range force long range force unstable force D neutralizing force 1 2 3 4 January 28 2010 Morning results A protons neutrons nucleons D all of the above 32 26 15 6 3 0 1 The radioactive decay of nature s elements occurs in the 2 4 Of alpha beta and gamma radiation two are high speed particles and the one that isn t is 92 1 2 3 4 3 A soil we walk on air we breathe interior of Earth D all of the above 1 3 4 When an element ejects an alpha particle the mass number of the resulting element 43 46 1 2 3 4 2 A alpha 35 beta gamma D all of the above are different forms of electromagnetic waves 1 2 3 4 A reduces by 2 reduces by 4 increases by 2 D increases by 4 34 16 11 8 0 1 3 0 2 3 4 When an element ejects a beta particle the atomic number of that element 44 1 2 3 4 A reduces by 1 increases by 1 reduces by 2 D increases by 2 1 22 2 3 4 Which of these is actually a high speed electron 1 2 3 4 25 11 1 2 3 4 Which of these is the most penetrating in common materials 69 51 A Alpha Beta Gamma D All of the above are high speed 1 2 3 4 31 A Alpha Beta Gamma D All of the above are equally penetrating 26 17 8 3 0 1 2 3 4 1 2 3 4 1 2 3 3 4 1 morning class didn t get to the last 5 slides When thorium 234 emits a beta particle thorium transforms to 86 1 2 3 4 A protactinium 232 protactinium 233 protactinium 234 D protactinium 235 Which of these radioactive elements is gaseous at 25 25 25 everyday temperatures 1 2 3 4 When food is exposed to gamma radiation the food 25 25 1 2 3 4 A Uranium Plutonium Radium D Radon 25 25 25 A unfortunately becomes slightly radioactive doesn t become radioactive at all will spoil faster D becomes quite radioactive and should be avoided by healthconscious people 9 6 0 1 2 3 4 A certain isotope has a half life of one day This means the amount of that isotope remaining at the end of three days will be 1 2 3 4 A zero one quarter half D one eighth 1 2 3 4 3 4 The half life of uranium 238 is 4 5 billion years Compared with the amount of uranium 238 in the Earth today only half this amount will exist in 1 2 3 4 1 2 1 1 2 3 4 3 When uranium 238 emits an alpha particle uranium 25 25 25 transforms to 1 2 3 4 A less than 4 5 billion years 4 5 billion years more than 4 5 billion years D none of the above 2 4 25 A thorium 242 thorium 238 thorium 234 D any of the above thorium isotopes 1 2 3 4 2
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