Atomic and Nuclear Physics Answers

What is the error in electronic balance

what is the atomic spacing between two iron atoms?

Two body of mass 10kg and 4kg are moving at opposite direction with the same velocity of 5m/s. If they collide together after their collision, calculate their common velocity

state one thing that is the same for atoms of both isotopes

The half-life of a radioactive nuclear source is 9 days. What fraction of nuclei is left 

undecayed after 3 days.

State whether the β – transition 1/2+ → 1/2-

is allowed or forbidden. Mention the degree of

forbiddenness in case of forbidden transition.

Let us define a rapidity distribution as y = R(y) - 0.5,        R(y) = Random number between 0 to 1 (Photons)

where a J/ψ (neutral pion) particle decays into two muons in the rest frame with p_T as exp [X₂] and X₂ = -X₁b where X₁ = 5R(y) and b = 0.15

Calculate invariant mass of the J/ψ (neutral pion) particle using two steps.

1)                   Decay initially in rest frame

2)                   Then, using generalized Lorentz transformation take it to lab frame.

An ancient beam of wood is discovered during an archiological dig and carbon dated. They find that the sample contains 12.5% of the count rate of a similar mass of living wood. The half-life of the carbon isotope is 5600 years. Calculate the age of the ancient wood.

A student is asked to use a computer simulation of radioactive decay. The sample chosen has a half-life of 2.5 hours and contains 38400 isotopes of radioactive material. Calculate the number of unstable nuclei remaining after 12.5 hours.

A teacher decides to determine the count rate of a radioactive sample stored at school. Her reading show that there are 240 counts in a time of two minutes. Calculate the count rate of the radioactive sample, including a suitable unit.