Atomic and Nuclear Physics Answers

E. The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is

prepared that has an initial activity of 7.56 ×1011 Bq.

i. How many Plutonium-199 nuclei are initially present in the sample?

ii. How many are present after 30.8 min?

iii. What is the activity at this time?

The magnitude of L, for a d-electron, in one electron atomic system is?

A detector of radioactivity in a laboratory indicates an average of 16 counts /min when no radioactive samples are present. A radioactive sample of half-life 1.5 days is placed close to the detector, which indicates a count rate of 208 counts /min. Calculate the count rate that is indicated 6 days later.

Calculate the total amount of energy released from the fission of 1 kg of U-235.

The energy required to remove both electrons from the Helium from its ground state is 79eV. Ho much energy is required to ionize Helium(remove one electron)?

A car travelling at 36km/h accelerates uniformly at 2m/s^2. Find its velocity in km/h in 5s time.

At rest, a uranium atom U238 decays into an alpha particle and a thorium atom Th234. Radioactive decay is like an elastic collision run backward; the particles begin stuck together and end by flying apart. In this process 8.64x10-13 J of energy is liberated. The mass of an alpha particle is 6.68x10-27 kg, and the mass of thorium is 3.91x10-25 kg. What is the momentum of the alpha particle after the decay?

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?

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 is the wavelength of the photon emitted by a hydrogen atom when a bound electron in the n = 3 state makes the transition to the n = 2 state? (to 2 s.f in nm)