Atomic and Nuclear Physics Answers

A radioactive material A ( decay constant A) decays into a material B( decay constant B) and into material C ( decay constant C) which is also radioactive. Determine the amount of C material remaining after a time t.

An electric field E can pull an electron out of a Helium atom in the same time that the electron takes
to go around the nucleus once. Then E is?

An atom has 3 protons and 3 neutrons. What is the atomic number?

N monoatomic atoms adsorbed on a surface are free to move on this
surface. To a
good approximation, the system can be treated as a two-dimensional
classical ideal gas
constrained to occupy an area A. The system is at temperature T.
Calculate the partition
function of the system. Using this, find an expression for the heat
capacity of one mole
of the system. If one mole of this system were instead confined to a
three-dimensional
volume, will the amount of heat energy required to raise the
temperature of the system
by 1 0 K be more, or less?

An unwary physicist accidentally ingests radioactive sample that is both an alpha emitter (RBEα = 20) and a gamma emitter (RBE = 1).

The 75 kg physicist absorbs 3 J of energy in the form of alpha particles and 10 J of energy in the form of gamma rays.

What is the total dose equivalent in rem that the physicist has been exposed to?

You have a radioactive sample which has an activity of 3.89E5 Bq at t = 0 s. Later on at t = 1540 s you measure the activity again and find it is 3.15E5 Bq.

What is the half-life of the sample? (to 3 s.f and in s)

Calculate the Fermi energy of sodium at 0 K if it has one free electron per
atom and density 970 kg/m3 and atomic weight 23.

What is tokamak? How it is used? what are the conditions behind this invension? Describe i its future prospects?

What velocity would a 60 kg person need to move at in order to have the same momentum as a 600 nm photon?

The B−(negative) meson is the lightest particle consisting of a b quark and u antiquark. Which type of interaction causes its decay.?Describe with explanation its decay chain.