A Proton Is Projected Toward a Fixed Nucleus of Charge

question 43

Multiple Choice

A proton is projected toward a fixed nucleus of charge +Ze with velocity vo.Initially the two particles are very far apart.When the proton is a distance R from the nucleus its velocity has decreased to 1/2 v_o.How far from the nucleus will the proton be when its velocity has dropped to 1/4 v_o?

• A)1/16 R
• B)1/4 R
• C)1/2 R
• D)4/5 R
• E)None of these

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