Atomic and Nuclear Physics Answers

In Compton scattering, the incoming and scattered photons have a different wavelength. If the outgoing photon has a wavelength which is 12% more than the incoming, what is the ratio of the outgoing photon energy to the incoming photon energy (E subscript text out end text end subscript over E subscript text in end text end subscript)? (2 s.f.)

A radioactive sample of thallium-207 has a half-life of 4.77 minutes has an activity of 1500 Ci.
What is the mass of the sample of thallium? (to 2 s.f and in µg)

What is basic principle of UV visible spectroscopy? What information do you get from UV spectra?What is meant by a red and blue shift?How to calculate band gap by UV visible spectrum?

Determine the total angular momentum quantum number if the minimum angle between the total angular momentum vector (in a single electron atom) and the z axis is 28.13°.

You have a radioactive sample which has an activity of 3.89×105 Bq at t = 0 s. Later on at t = 1540 s you measure the activity again and find it is 3.15×105 Bq.

What is the half-life of the sample?

A radioactive sample of thallium-207 has a half-life of 4.77 minutes has an activity of 1500 Ci.
What is the mass of the sample of thallium? (to 2 s.f and in µg)

The Bethe-Weizsacker formula (Semi empirical mass formula) provides an excellent
representation of the mass systematics of nuclei. Show explicitly that, for fixed A, M(A, Z) has a
minimum value. Is there evidence for the "valley of beta stability"? What is the stablest nucleus
with A = 16? What about A = 208?

What velocity would a 60 kg person need to move at in order to have the same momentum as a 600 nm photon? (to 2 s.f and in m s−1)

A 2.0 mm thick sheet of shielding allows 80% of incident gamma radiation to pass through it.
How many layers of this shielding are required such that less than 30% of incident gamma rays to pass through all layers? (to 2 s.f)

You are standing on the edge of a pond looking at a fish as shown in the figure above. The fish is located at a distance D = x1 + x2 from the bank.
Your eyes are located 1.5 m above the surface of the water at the edge of the water and your gaze is 25° below the horizontal.
Although it does not appear to be so from your point of view, the fish is actually 0.50 m below the surface of the water. How far away from the bank (D) is the fish? (to 2 s.f and in m)