Uranium Decomposes Radioactively to Form Thorium (Atomic Number 90)by Emitting $\alpha$

question 30

Multiple Choice

Uranium decomposes radioactively to form thorium (atomic number 90) by emitting an $\alpha$ particle from its nucleus.The force of repulsion between the thorium nucleus and the $\alpha$ particle when the distance between them is 9.0 fm is approximately

• A)7.2 fN
• B)57 nN
• C)4.6 pN
• D)1.02 kN
• E)0.51 kN

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