A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?
A. (15)/16 B. (1)/16 C. (3)/4 D. (1)/4 Correct Answer: Option A = (15)/16 Explanation 16 days = 4 half lives. The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16. ∴ fraction delayed =...
One of the properties of gamma rays is that they are?
A. neutral B. massive C. positively charged D. negatively charged Correct Answer: Option A – neutral
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 emissionProducts
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