Quiz 14

12/13/2005

Ch. 31

Useful numbers: Mass of proton=1.007276u

Mass of neutron=1.008665u

1)Find the binding energy for ₄⁹Be. Mass of Be is 9.01218u

2) ²¹⁴Pb decays via two β⁺ decays followed by one α decay.

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a) What are the final products?

b) The half-life for the ²¹⁴Pb decay is 27 min. After 10 hrs you find that 3g remain.

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How much did you start with?