A) Electron
B) Charged helium atom
C) Proton
D) Positron
Correct Answer: B
Solution :
| Symbol | Relative charge | Absolute charge (coulomb) | Mass (Kg) | Mass (amu) | Relative mass | |
| alpha particle | \[_{2}^{4}H{{e}^{2+}}\]or \[\alpha \] | +2 | \[+2\times 1.6\] \[\times {{10}^{-19}}\] | \[6.67\] \[\times {{10}^{-27}}\] | +4.008 | 4 |
| electron | \[_{-1}{{e}^{0}}\] | \[-1\] | \[-1.6\] \[\times {{10}^{-19}}\] | 9.11 \[\times {{10}^{-31}}\] | 0.00054 | 0 |
| proton | p or \[_{1}{{H}^{1}}\] | +1 | +1.6 \[\times {{10}^{-19}}\] | 1.673 \[\times {{10}^{-27}}\] | 1.00727 | 1 |
| neutron | \[_{0}{{n}^{1}}\] | 0 | 0 | 1.675 \[\times {{10}^{-27}}\] | 1.00867 | 1 |
| positron | \[_{+1}{{e}^{0}}\] | +1 | +1.6 \[\times {{10}^{-19}}\] | 9.11 \[\times {{10}^{-31}}\] | 0.00054 | 40 |
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