The Attractive Force Between Protons and Neutrons in the Nucleus

question 32

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

Recognize the importance of neutral theory and the balance between mutation and genetic drift.

Identify the factors influencing the difficulty of obtaining correct sequence alignments.

Understand the significance of the mutation rate in evolutionary timescales.

Assess the role of selection in shaping genetic variation and evolutionary trajectories.

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