### What is the speed of the emitted electron

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##### Reference no: EM13308250

The glow-in-the-dark dials on some watches and some keychain lights shine with energy provided by the decay of radioactive tritium, 3^1H. 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 21MBq.
Part A What is the speed of the emitted electron? (This speed is high enough that youâ€TMll need to do a relativistic calculation.) include units

Part B What is the power, in watts, provided by the radioactive decay process? include units

Part C What will be the activity of the tritium in a watch after 7 years, assuming none escapes?

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