by Sunday | Nov 15 | Physics JAMB
A. 24cm B. 16cm C. 12cm D. 8cm Correct Answer: Option B – 16cm Explanation For a string fixed at both ends and plucked at the middle, the fundamental frequency is given by f0 = v/λ, where v = velocity of sound, λ = wave length. At its fundamental, note, the the...
by Sunday | Nov 15 | Physics JAMB
A. 2m B. 4m C. 1m D. 3m Correct Answer: Option C = 1m Explanation If F = 85.5Hz, V = 342ms−¹, Then wavelength = V/F = 342/85.5 = 4m Then if wavelength = 4m => wavelength/2 = 4/2 = 2m = NN, Thus NA = wavelength/4 = 4/4 =...
by Sunday | Nov 15 | Physics JAMB
A. alcohol B. mercury C. helium D. platinum Correct Answer: Option B – mercury Explanation Mercury is the “liquid of choice” in thermometers because mercury changes density very linearly.
by Sunday | Nov 15 | Physics JAMB
A. 2 : 5 B. 5 : 4 C. 5 : 2 D. 4 : 5 Correct Answer: Option B – 5 : 4 Explanation P1 = 300Nm-2; P2 = 120Nm-2 T1 = 127 + 273; T2 = -73 + 273 = 400K; = 200K Let the initial volume V1; and the final volume = V2 ∴ P1V1/T1 = P2V2/T2 P1V1T2 = P2V2T1 ∴ V2/V1 = P1T2/P2T1...
by Sunday | Nov 15 | Physics JAMB
A. 8/7 B. 4/9 C. 9/2 D. 4/7 Correct Answer: Option B – 4/9 Explanation A driving mirror is always a convex mirror which is always of negative focal length and always forms a virtual image Thus if r = 1m = 100cm f = 1/2 = -50 ∴ if U = 4cm = 400cm f = -50cm ∴1/u +...
by Sunday | Nov 15 | Physics JAMB
A. improving the sharpness B. creating an inverted image C. magnification of the image D. erection of the image Correct Answer: Option D – erection of the image Explanation The extra lens in the terrestrial telescope mounted at the middle between the objective...
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