The battery connection that permits current to flow across a p-n junction is called?
A. reverse biased B. forward biased C. amplification. D. rectification Correct Answer: Option B – forward biased
The process through which free electrons leave the surface of hot metal is known as?
A. photon emission B. photo emission C. thermionic emission D. electron emission Correct Answer: Option C = thermionic emission
The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. calculate the frequency of the photon. [e = 1.6 x 10^-19c; h = 6.6 x 10^-13js]
A. 1.3 x 10-15 Hz B. 3.1 x 1052 Hz C. 3.2 x 10-53 Hz D. 8.0 x 1014 Hz Correct Answer: Option D = 8.0 x 1014 Hz Explanation E = hf f = (E)/h ∴ f = (3.3 x 1.6 x 10-19)/6.6 x 10-34 = 0.8 x 1015 = 8.0 x...
Which of statements below about machines are true?
I. Work done by load is always less than the work done by effort. II. All machines are made of levers, pulleys, screws and gear wheels. III. A fishing rod is a machine. Iv. Effort is always larger than load. A. II and III B. III and IV C. I and III D. II and iv...
The correct unit of energy density is?
A. kg m3 s-2 B. kg m2 s-2 C. kg m-3 s-2 D. kg m-1 s-2 Correct Answer: Option D = kg m-1 s-2Products
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