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Can somethings decay constant change. ive been asked this question. the isotope strontium-90 has half life of 28 years Calculate its decay constant in units of year-1 and second-1. please help?
Wiki User
∙ 14y ago
Decay constant and half life are mathematically related. One cannot change without the other changing, so - no - an isotope's decay constant cannot change.
Do not confuse this with the fact that isotopes form other isotopes as they decay, and those other isotopes might have different half lives, so the gross observation of total activity may seem to indicate a change in rate - the reality is still no - the decay constant of a particular isotope does not change.
Wiki User
∙ 14y ago
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To be very technical regarding the language of the question, No.The question specifies "constant velocity" ... meaning constant speed AND direction.If either of these is changing, then acceleration is present.But if the question meant to say "constant SPEED", then the answer is Yes. An object may be traveling at constant speed, but if its path is not a straight line, then there is acceleration present.
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The question is inherantly flawed. A car traveling at a constant speed cannot accelerate, if it could it's speed would not be constant. "Constant speed" means that speed is not increasing or decreasing but remain consistent over time. For example, if you cover 10 feet during each second, your speed is constant. "Constant velocity" implies constant speed, but it has an additional constraint: you can't change your direction. If you travel constantly at 10 feet per second in a straight line, then your speed is constant and your velocity is constant. But if you travel constantly at 10 feet per second in a wiggly line (or a circle, or anything not straight), then your speed is constant but your velocity is NOT constant. If you travel at a constant speed but change direction, velocity is changed. Or if you travel in the same direction but change the speed, velocity is changed. Average speed is is easier: distance/time So, your question should read: Why can a car traveling at an average speed accelerate, but a car traveling at constant speed cannot? Or Why am I asking the wrong questions?
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