Watch dials are often painted with a compound containing tritium, which has a half-life of 12.3 years. when the tritium atom undergoes beta decay the emitted electron strikes a fluorescent pigment, which then glows. if your tritium-dial watch is giving off a certain amount of light, how many half-lives must pass until the watch gives off only one-eighth as much light?
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Physics, 22.06.2019 21:20
16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.
Answers: 2
Watch dials are often painted with a compound containing tritium, which has a half-life of 12.3 year...
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