The half-life of C-14 is 5730 years. The measurement of the percentage of the C-
ID: 1069207 • Letter: T
Question
The half-life of C-14 is 5730 years. The measurement of the percentage of the C-14 remained in a tree that died was found to be 10.8%, how long the tree was left undisturbed after it died? a) 19, 680 yrs b) 945 yrs c) 18, 400 yrs A Geiger-Muller counter is a: a) photographic detector b) Cloud chamber c) gas ionization counter which of the following processes decreases the atomic mass by two? a) alpha emission b) two neutrons emission c) two positrons emission Electron-capture which is also called K-Capture is associated with a) Conversion of a neutron to a proton b) Decrease in the atomic number c) Increase in mass number.Explanation / Answer
30 ) ans = c
Geiger - Muller counter is a gasionization counter.
31) ans = a - alpha emission
When alpha particle is emitted, atomic mass decreased by 2.
Because, alpha paticle = 42He
32) ans = b
In electron capture reactions, atomic mass decreases.
116C + e- ------------> 115 B
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