Theory of Alpha Decay

A ${\mathrm{U}}^{238}$ Preparation of mass $1.0\mathrm{g}$ emits $1.24 \times {10}^4$ Alpha-particles per second. Find the half-life of this nuclide and the activity of the preparation.

What is tunnel effect how tunnel effect explain alpha decay?

Tritium has a half of 12.5 y undergoing beta decay. What fraction of a sample of pure tritium will remain undecayed after 25y.

What happens to the half-life of a radioactive substance as it decays?

The rays are given off by a radioactive element from;

Alpha particles _____ penetrate into human body.

A nucleus of mass number $220$ decays by α decay. The energy released in the reaction is $5 \mathrm{MeV}$. The kinetic energy of an α-particle is:

The kinetic energy (in $\mathrm{keV}$) of the alpha particle, when the nucleus ${}_{84}{}^{210}\mathrm{Po}$ at rest undergoes alpha decay, is

The tunnel effect is the name given to the phenomenon that describes the crossing of a quantum mechanical _____ barrier by the particle with some energy. An alpha particle is also known as the nucleus of a helium atom.

Tunnel effect explained α -decay 

 Explain the tunnel effect.

The phenomenon explained by tunnel effect is

What happens when alpha particles collide?

How does an alpha particle become neutral?

What is the energy of alpha particles?

Do alpha particles have discrete energies?

Why is alpha particle have discrete energy?

What happens to electrons during alpha decay?

How do you calculate the decay constant?

What is the relation between mean life and decay constant?