The Attractive Force Between Protons and Neutrons in the Nucleus $\pi$

question 16

Multiple Choice

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m _$\pi$ = 140 MeV/c²) .Estimate the longest time a virtual $\pi$ ⁰ can exist,in accordance with the uncertainty principle $\Delta E \Delta t = \hbar / 2$ .(1 eV = 1.6 *10 ^{- 19} J. )

• A)2.4 *10 ^{- 24} s
• B)6.9 *10 ^{- 27} s
• C)3.3 * 10 ^{- 18} s
• D)2.4 *10 ^{- 21} s
• E)1.6 *10 ^{- 19} s

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