WAEC Physics 2017 Objective — Question 49

Question 49 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.

A nuclide represented as ⁷⁰₃₂X has a neutron-proton ratio of

A. A. 0.5
B. B. 0.8
C. C. 1.2Correct
D. D. 5

Explanation

70=[number of neutrons]+proton, and 32=no of protons. Therefore, number of neutrons=70-32=38. Ratio of neutron to proton = number of neutrons/number of protons = 38/32 = 1.2.

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