The Attractive Force Between Protons and Neutrons in the Nucleus

question 20

Multiple Choice

The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (mπ = 140 MeV/c²) .Estimate the longest time a virtual π⁰ can exist,in accordance with the uncertainty principle
) (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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