5. 6.24/12.5 points I Previous Answers ZinPhyslS3 5.P 013. My Notes Ask Your Tea

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5. 6.24/12.5 points I Previous Answers ZinPhyslS3 5.P 013. My Notes Ask Your Teacher Polonium-210 (210P0) is a radioactive isotope that has an atomic nucleus with 84 protons and 126 neutrons together, 210 nucleons). It undergoes an -decay with a half-life of 138.4 days, resulting in a stable lead-206 206Pb) isotope with a mass of 205.974 u. Assuming the polonium nucleus is at rest when it decays, an -particle 4He with a speed of 1.6 × 107 m/s is emitted. The a particle has a mass of 4.002 u. The atomic unit u is defined as 1 u-1.6605677 10.27 kg (a) In what direction does the daughter isotope 206pb move? O In the opposite direction as the -particle. In the same direction as the -particle (b) What is the speed (in m/s) of the 20Pb leaving the decay zone? 310835 m/s (c) Compare both speeds in this problem to the speed of light in vacuum Vpb

Explanation / Answer

speed of light in vacuum = 3x 10^8 m/s

a)1.6 x 10^7/ 3x 10^8 = 0.053 apprx

b)) 310835 / (3x 10^8 ) = 0.001 apprx

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