Atomic and Nuclear Physics
Ashes from a fire in the forest show carbon-14 activity of only 1/8 the activity of fresh wood. How long ago the forest had fire?
18590 years
17190 years
16580 years
14820 years
17190 years
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The half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, then the time for which count rate reaches 46 counts per minute would be?A. 30 minutes
B. 40 minutes
C. 15 minutes
D. 23 minutes
A compound containing some amount of radioisotope is
A. tracer
B. radioactive compound
C. non radioactive
D. linear active compound
Most of the nuclei with atomic number 1 to 82 are
A. positive nuclei
B. negative nuclei
C. unstable nuclei
D. stable nuclei
If a radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute, then how long will it take for the count rate to drop to 125 per minutes
A. 120 minutes
B. 90 minutes
C. 30 minutes
D. 60 minutes
In the nuclide defined by 157X, the number of protons and neutrons respectively are
A. 7 and 8
B. 15 and 7
C. 8 and 6
D. 23 and 15
The fast-moving light photons are
A. alpha radiation
B. gamma radiation
C. beta radiations
D. no radiations
The positive charge in an atom was concentrated in a small region called
A. atomic mass
B. electron
C. proton
D. nucleus
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