Atomic and Nuclear Physics

Atomic and Nuclear Physics
The matter is built from small particles called
radiant
atoms
isotopes
ions
Author: rikazzz Comment
Atomic and Nuclear Physics
The radiation emitted from the splits into
2 components
4 components
5 components
3 components
Author: rikazzz Comment
Atomic and Nuclear Physics
The activity of 1 gram of radium is
3.73 × 10⁴ MBq
4.58 × 10⁴ MBq
1.69 × 10⁴ MBq
2.56 × 10⁴ MBq
Author: rikazzz Comment
Atomic and Nuclear Physics
The positive charge in an atom was concentrated in a small region called
atomic mass
electron
proton
nucleus
Author: rikazzz Comment
Atomic and Nuclear Physics
The fast-moving light photons are
alpha radiation
gamma radiation
beta radiations
no radiations
Author: rikazzz Comment
Atomic and Nuclear Physics
In the nuclide defined by ¹⁵₇X, the number of protons and neutrons respectively are
7 and 8
15 and 7
8 and 6
23 and 15
Author: rikazzz Comment
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
Author: rikazzz Comment
Atomic and Nuclear Physics
Most of the nuclei with atomic number 1 to 82 are
positive nuclei
negative nuclei
unstable nuclei
stable nuclei
Author: rikazzz Comment
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
Author: rikazzz Comment
Atomic and Nuclear Physics
A compound containing some amount of radioisotope is
tracer
radioactive compound
non radioactive
linear active compound
Author: rikazzz Comment

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