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Chapter 21 - Nuclear Physics - 7
1.
Atomic number is defined as the number of protons and neutrons in an atom
a) False
b) True
2.
The number of neutrons are always equal to number of electrons in an atom.
a) True
b) False
3.
Electron was discovered by J.J.Thomson in 1891.
a) False
b) True
4.
The charge on
b
- particle is equal to that of electron.
a) True
b) False
5.
The mass number remains constant during
b
-decay.
a) True
b) False
6.
Most of the natural radioactive elements have very long life times.
a) False
b) True
7.
During the half life of a radioactive elements 1/3 of its atoms decay into daughter elements.
a) False
b) True
8.
A slow neutron can cause fission in
92
U
238
a) True
b) False
9.
An
a
-particle is about 7000 time more massive than a proton.
a) False
b) True
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