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PHY 104 PHY 104 Past Questions Objective Question
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Question

Find the mass defect of 63Cu if the actual mass of copper is 62.91367 u. (Given: Rest mass of proton = 1.007276 u, Rest mass of neutron = 1.008665 u)
Options
A 6.73728 u
B 2.977889 u
C 0.59223 u
Correct Answer
D 1.99773 u
Correct Answer

Option C is the correct answer.

Detailed Explanation

Copper-63 (63Cu) has 29 protons (atomic number) and 63 - 29 = 34 neutrons.Total mass of constituent particles = (Number of protons * mass of proton) + (Number of neutrons * mass of neutron)Total mass = (29 * 1.007276 u) + (34 * 1.008665 u)Total mass = 29.211004 u + 34.29461 u = 63.505614 uMass defect = (Total mass of constituent particles) - (Actual mass of atom)Mass defect = 63.505614 u - 62.91367 u = 0.591944 u.The closest option is 0.59223 u.

Hint

Calculate the total mass of the individual protons and neutrons first, then subtract the actual mass of the atom to find the mass defect.

Question Info

Course: PHY 104
Topic: PHY 104 Past Questions
Type: Objective
Difficulty: Not specified
Question 726 of 947
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