Alpha particles
Alpha particles have charge +2e and produce dense ionization over a short path. Their ionizing power is generally greater than that of beta particles, gamma rays and X-rays, although their penetration is much lower.
Important Questions from Radioactivity
- The energies of the 3 lowest states of an atom are E 0 = −14 eV, E 1 = −9 eV and E 2 = −7 eV. The Einstein coefficients are A 10 = 3 × 10 8 s −1 , A 20 = 1.2 × 10 8 s −1 and A 21 = 8 × 10 7 s −1 . If a large number of atoms are in the energy level E 2 , the mean radiative lifetime of this excited state is
The nuclei of 137 Cs decay by the emission of β - particles with a half life of 30.08 years. The activity (in units of disintegrations per second or Bq) of a 1 mg source of 137 Cs, prepared on January 1, 1980, as measured on January 1, 2021 is closest to
The Q - value of the α - decay of 232 Th to the ground state of 228 Ra is 4082 keV. The maximum possible kinetic energy of the α - particle is closest to
Radioactivity is the characteristic of which of the following?
A free neutron decays spontaneously into a proton, an electron and ___________ .
