The glow-in-the-dark dials on some watches and some
Chapter , Problem 14AIP(choose chapter or problem)
Problem 14AIP
The glow-in-the-dark dials on some watches and some keychain lights shine with energy provided by the decay of radioactive tritium, . Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. Each decay emits an electron with an energy of 19 keV. A typical new watch has tritium with a total activity of 15 MBq.
a. What is the speed of the emitted electron? (This speed is high enough that you’ll need to do a relativistic calculation.)
b. What is the power, in watts, provided by the radioactive decay process?
c. What will be the activity of the tritium in a watch after 5 years, assuming none escapes?
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