by Sunday | Nov 14 | Physics JAMB
A. x-rays are more penetrating than gamma rays B. x-rays are electromagnetic radiations while gamma rays are negatively charged radiation C. x-rays have higher frequencies than gamma rays D. x-rays arise from energy changes in the electronic structure of atoms while...
by Sunday | Nov 14 | Physics JAMB
A. 0.1μF B. 0.3μF C. 1.0μF D. 0.5μF Correct Answer: Option A – 0.1μF Explanation 1/C = 1/0.3 + 1/0.5 + 1/0.2 = 10.3333 => C = 1 / 10.3333 = 0.09677 ≅ 0.1μF ∴ C = 0.1μF
by Sunday | Nov 14 | Physics JAMB
A. the appliances are maintained at a lower p.d than the earth B. both the a.c and d.c sources can be used C. a person touching the appliances is safe from electric shock D. the appliances are maintained at a higher p.d than the earth Correct Answer: Option C –...
by Sunday | Nov 14 | Physics JAMB
A. 1.0 x 1020 B. 1.0 x 10-18 C. 1.0 x 10-17 D. 1.0 x 1017 Correct Answer: Option D – 1.0 x 1017 Explanation Current (I) = q/t → q = i x t = 16 x 10-3 x 1 = 1.6 x 10-2C But 1.6 x 10-19C = I electronic charge 1 coulomb = 1 / (1.6×10-19) ∴ 1.6 x 10-2 coulombs...
by Sunday | Nov 13 | Physics JAMB
A. 9.6J B. 2.4J C. 12.0J D. 7.2J Correct Answer: Option B – 2.4J Explanation Energy stored = Ivt = current x back e.m.f x time = 2 x 3 x 0.4 = 2.4J
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