![Calculate the length of a constantan wire of cross-sectional area 4 π x 10-8m² and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
by Sunday | Aug 31 | Physics WAEC
A. 0.42m B. 2.40 m C. 6.25 m D. 183.75 m E. 590.00 m Correct Answer: Option B – 2.40 m Explanation R = PL/A => L =RA/P =21 x 4π x 10^8/1.1 x 10^-6 = 2.40
by Sunday | Aug 31 | Physics WAEC
A. Polarization B. Local action C. Formation of hydrogen electrode D. Increase in the resistance of the cell E. Generation of less current by the cell Correct Answer: Option B – Local action
by Sunday | Aug 31 | Physics WAEC
A. Musical notes consist of the combination of sounds of regular frequency B. The combination of overtones produced by an instrument determines the quality of the sound C. the loudness of sound is determined by its frequency D. the pitch of a note depends on the...
by Sunday | Aug 31 | Physics WAEC
l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves IV. Waves produced by a flute A. I and II only B. I and III only C. II and III only D. II and IV only E. III and IV only Correct Answer: Option D – II and IV...
by Sunday | Aug 31 | Physics WAEC
A. 36.67m B. 74.25m C. 148.50m D. 297.00 E. 366.67m Correct Answer: Option C – 148.50m Explanation v = 2x/t ∴ distance x = vt/2 = 148.5m
by Sunday | Aug 31 | Physics WAEC
A. Radio waves B. Light waves C. X-rays D. infra-red rays E. Ultraviolet rays Correct Answer: Option C – X-rays
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