Atoms and Nucle...

During a nuclear fusion reaction

Velocities of light in vacuum and glass are represented by C and C_g. When electrons move through glass with a velocity v, there is emitted a visible radiation in glass, if

Neutrons are more effective for producing nuclear reactions with nuclei compared to protons because

The statistics obeyed by neutrino is

Two nucleons are at a separation of 1 fm. The net force between them is F₁ if both are neutrons, F₂ if both are protons, and F₃ if one is a proton and the other is a neutron.

The wavelength of gamma-rays is of the order of

The decay constant of a radioactive sample is λ. The half-life and mean life of the sample are respectively given by

In the uranium radioactive series, the initial nucleus is ₉₂U²³⁸ and that the final nucleus is ₈₂Pb²⁰⁶. When uranium nucleus decays to lead, the number of α particles and β particles emitted are

The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds, it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds will be

The half life of At 215 is 100μ sec. If a sample contains 215 mg of At 215, the activity of the sample initially is