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 yrs.
b. 30 yrs.
c. 40 yrs.
d. 50 yrs.
A certain watch’s luminous glow is due to zinc sulfide paint that is energized by beta particles given off by tritium, t
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A certain watch’s luminous glow is due to zinc sulfide paint that is energized by beta particles given off by tritium, t
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