Atomic and Nuclear Physics Answers

The degeneracy of spectral term 3F is
(A) 7 (B) 9
(C) 15 (D) 21

Sodium has a work function of 2.36eV. If a beam of monochromatic 442-nm light is incident upon a sample of sodium, will electrons be ejected? At what speed?

the transition J=0 to J=1 in a HCL molecule occurs at 10.08/cm. the rotational constant ?
Answer: 5.34

The disintegration constant of ²³⁸U is 4.87×10⁻¹⁸s⁻¹. Calculate its half life(in years). Also calculate the number of disintegration per second from 1 gram of Uranium. It is given that Avogadro's number= 6.02×10²³

Define binding energy. Calculate the binding energy per nucleon of Fe. Given
( Fe) = 55.934932u, Mn= 1.008665u and Mp= 1.007825 u.

Calculate the activity of K40 in 100kg man assuming that 0.35% of the body weight is potassium. The abundance of K40 is 0.012%, its half life is 1.31 109 years [ Avagadro number, N= 6.023 106] .

A gamma spectrometer delivers a 10ns pulse of 1Mw average power. If the photons have a wavelength of 694.3nm, how many are contained in the pulse

A star ending its life with a mass of twice the mass of the sun is expected to collapse combining its proton and electron to form a neutron star. If a star of mass 2.0× 1.99×1030kg collapsed into the neutron what would be its radius?

Calculate the time of free fall of an HI cloud of density 10^6
particles/m3
.

The lattice constant for KCl is 6.292 Å and the Young’s modulus in the [100] direction is 210Nm102.3−×. Calculate the force constant and the frequency at which electromagnetic radiation is strongly reflected by the KCl crystal. The atomic weights of K and Cl are 39 amu and 37 amu respectively.