A certain watch’s luminous glow is due to zinc sulfide paint that is energizedby beta particles given off by tritium, the radioactive hydrogen isotope 3H,which has a half-life of 12.3 years. This glow has about 1/10 of its initialbrightness. How many years old is the watch?A. 20 yr B. 30 yr C. 40 yr D. 50 yr
A certain watch’s luminous glow is due to zinc sulfide paint that is energized by beta particles given off by tritium, the radioactive hydrogen isotope 3H, which has a half-life of 12.3 years. This glow has about 1/10 of its initial brightness. How many years old is the watch? A. 20 yr B. 30 yr C. 40 yr D. 50 yr
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