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An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is

A. 80.0W
B. 40.0W
C. 10.0W
D. 0.1W

View Answer & Discuss (7) JAMB 2000

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]

A. 6630.0V
B. 663.0V
C. 66.3V
D. 6.6V

View Answer & Discuss (8) JAMB 2000

If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?

A. 24 years
B. 20 years
C. 10 years
D. 2 years

View Answer & Discuss (6) JAMB 2000

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A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are

A. beta rays
B. gamma rays
C. x-rays
D. unltr-violet rays

View Answer & Discuss (10) JAMB 2000

A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is

A. 200 Ω
B. 50 Ω
C. 100/π Ω
D. 25/π Ω

View Answer & Discuss JAMB 2000

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