Asked by julie

The half-life of 156Hf is 0.025 s. How long will it take a 560 g sample to decay to one-fourth its original mass?
Answered by R_scott
1/4 = 1/2 * 1/2 ... two half-lives

2 * 0.025 s = ?
Answered by jasmin
0.0125 seconds
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