From the generating station to each substation power is transmitted at a very high voltage so as to reduce?
A. hysteresis loss B. eddy current loss C. magnetic flux leakage D. heating in the cells Correct Answer: Option B – eddy current loss
The percentage of the original nuclei of the sample of a radioactive substance left after 5 half-lives is?
A. 8% B. 5% C. 3% D. 1% Correct Answer: Option C = 3% Explanation After 5 half-lives, the fraction of any radio-active substance left = (1/2)5 = 1/32 Thus the percentage of the original nuclie = 1/32/1 x 100/1 assuming the original amount is unity percentage left...The energy associated with the photon of a radio transmission at 3 x 10^5 Hz is [h = 6.63 x 10^-34Js]
A. 2.00 x 10-28J B. 1.30 x 10-28J C. 2.00 x 10-29J D. 1.30 x 10-28J Correct Answer: Option A Explanation A photon of energy E = hf = 6.63 x 10-34 x 3 x 105 = 19.89 x 10-29 = 2.0 x 10-28J
Pure silicon can be converted to a p-type by adding a controlled amount of?
A. trivalent atoms B. tetravalent atoms C. pentavalent atoms D. hexavalent atoms Correct Answer: Option A – trivalent atomsProducts
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