Question
A physicist scatters $\gamma$ rays from a substance and sees evidence of a nucleus $7.5\times 10^{-13}\textrm{ m}$ in radius. (a) Find the atomic mass of such a nucleus. (b) What is unreasonable about this result? (c) What is unreasonable about the assumption?
1. $2.4\times 10^{8}$
2. The greatest known mass number is 266 for Meitnerium (Mi). \$2.4\times 10^{8} is 6 orders of magnitude larger, and therefore unrealistic.
3. The measurement can not be assumed to be the nuclear radius.
Solution Video