by Sunday | Nov 13 | Physics JAMB
A. 1.00 x 107s B. 6.93 x 106s C. 1.00 x 10-7s D. 6.93 x 107s Correct Answer: Option B = 6.93 x 106s Explanation Average life / Half life (T½) = ln2/λ = 0.693/10-7 = 0.693 x 107 = 6.93 x 106
by Sunday | Nov 13 | Physics JAMB
A. armature coil should be made of silver B. commutator should be replaced with slip ring C. commutator should be replaced with split rings D. armature coil should be made of aluminium Correct Answer: Option B – commutator should be replaced with slip...
by Sunday | Nov 13 | Physics JAMB
[atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U] A. 4.033U B. 2.017U C. 0.033U D. 0.330U Correct Answer: Option C Explanation The binding energy of a nucleus is the work done or energy needed to separate completely the nucleons (protons and...
by Sunday | Nov 13 | Physics JAMB
A. positive holes alone B. majority carriers C. electron alone D. minority carriers Correct Answer: Option D = minority carriers Explanation In a reverse-biased junction diode, only a very small current flows in, carried by the minority carriers which are the negative...
by Sunday | Nov 13 | Physics JAMB
A. λ = hc/E B. λ = h/P C. λ = c/f D. λ = 2 d sin θ Correct Answer: Option B = λ = h/P Explanation I wave-particle duality of matter, the momentum of the sub-atomic particle is given by P = h/λ where h = Planck constant; λ = wave length => λ =...
by Sunday | Nov 13 | Physics JAMB
A. 33.0 B. 0.1 C. 90.0 D. 10.0 Correct Answer: Option D = 10.0 Explanation Sensitivity of a measuring instrument is given by deflection per unit current: and given that deflection = 30o; and current (I) = 3A: then the sensitivity of the meter = 30/3 =...
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