by Sunday | Nov 14 | Physics JAMB
A. 1200W B. 600W C. 120W D. 30W Correct Answer: Option A – 1200W Explanation An a.c current is usually expressed as I = Io sin wt; and comparing this with the given current I = 10sin (120π)t, => Io = 10. and power in an a.c circuit is given as: P = I²R = (10²...
by Sunday | Nov 14 | Physics JAMB
A. 2.17V B. 1.49V C. 1.09V D. 0.34V Correct Answer: Option D – 0.34V Explanation The stopping potential is the potential required to stop the most energetic photo-emitted electron. From the relation e Vs = K.E,(max) where e is the electron charge, and Vs is the...
by Sunday | Nov 14 | Physics JAMB
A. 90° B. 45° C. 30° D. 0° Correct Answer: Option C – 30° Explanation The force on a moving charge in a magnetic field is given by F = q V β sin θ and this force is maximum when θ = 90o, during which sin 90° = 1: and for sinθ = 0.5, θ =...
by Sunday | Nov 14 | Physics JAMB
A. 8V B. 16V C. 20V D. 80V Correct Answer: Option D – 80V Explanation The induced voltage = time rate of change of magnetic flux i/e E = NΔ∅B Δt But ∅B = Magnetic Flux = Magnetic Induction (B) x (A) = 0.4T x 0.4m2 = 0.16 volt second i/e E = NΔ∅B Δt = 0.16 x 10 x...
by Sunday | Nov 14 | Physics JAMB
A. 200 count / min B. 100 count / min C. 50 count / min D. 25 count / min Correct Answer: Option C – 50 count / min Explanation 116 days = 4 half-lives Thus, after 4 half lives the fraction left of any radioactive materials is given by (1/2)4 = 1/16 ∴ Count rate...
by Sunday | Nov 14 | Physics JAMB
A. incident angle is equal to the angle of refraction B. refraction angle equals 90° C. incident angle equals 90° D. incident angle is equal to the angle of emergence Correct Answer: Option D – incident angle is equal to the angle of emergence Explanation At...
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