Atomic and Nuclear Physics Answers

a piece of wood from an ancient boat was found to show c14 activity of 5 counts per minute an equal amount of wood of recent date give a count rate of 20 counts per minute the half life of c14 is 5568 years the age of the boat

E and K represent the energy and wave vector of an electron respectively then the effective number of electrons in a band is proportional to
1)E
2)(dE/dK)
3)(d²E/dK²)
4)(dE/dK)²

The number of nucleons a state with contact number j is
1)(2J+1)
2)2(2J+1)
3)(2j+1)
4)2(2j+1)

the stopping potential of a photoelestric chamber is 3v the work function is 2.2ev calculate the incident photon energy and frequency

An electron capture reaction
1)a neutrino is created
2)antineutrino is created
3)beta + is emitted
4)beta- is emitted

a beta particle of energy 1MeV enters a thin window detector tube filled with methane and organ and initiates an avalanche of 5×10^10 Ion pairs the average energy lose per ion pair creation is 50 eV. the multiplication factor is

500 alpha particles of energy 5 MeV enter ionization chamber per second the energy required for ion pair creation is 25 eV. the ionization currently produced is
1)1.6×10^-11
2)9×10^-11

the intensity ratio of the principal series doublet is
1)1:3
2)2:3
3)2:1
4)1:5

The half-life of Yttrium-91 is 59 days. How much of a 90.3 g sample of Yttrium-91 will remain after 324 days?

(answer is in grams, no units required)

I neeed help... I need the answer of some questions kindly help me out.

1 What is the function of neutron in the nucleus of the atom?
2 Is it possible to find the density of protons, neutrons and electrons or just the nuclei?
3 Electrons, as negatively charged particles, not only rotate about the core of atom but also about their own axis (spin) Why this happens?
4 A bird is perched on high voltage power line, why is the bird not electrocuted?
5 Two objects with different masses have the same kinetic energy. Which has the larger magnitude of momentum?
5Is it possible to find the density of protons, neutrons and electrons or just the nuclei?