Atomic and Nuclear Physics
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
120 minutes
90 minutes
30 minutes
60 minutes
120 minutes
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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
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?
A. 18590 years
B. 17190 years
C. 16580 years
D. 14820 years
Most of the nuclei with atomic number 1 to 82 are
A. positive nuclei
B. negative nuclei
C. unstable nuclei
D. stable nuclei
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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