Task 4.8
What is the De Broglie wavelength of a thermal neutron having an energy equal to the average
Energy of thermal motion at a temperature of 300 K.

Task 4.18
The average lifetime of this meson is 2.4 × 10-19 s, and its rest energy is 549 MeV. Calculate
Minimum uncertainty of the particle mass.
Task 4.28
The particle is in an infinitely deep one-dimensional, potential well of width l on the second
Energy level. Determine the probability of detection of a particle in the range from 0 to l / 3.

Task 4.38
What is the smallest potential difference that must be applied to an X-ray tube with a tungsten
Anticathode, so that in the spectrum of characteristic X-ray radiation there are all lines of the K-series?

Task 4.48
What proportion of the initial amount of radioactive isotope decays during the lifetime of this
Isotope?
Task 4.58
Calculate the energy of the nuclear reaction p + 115 B -> 342 He.
Task 4.68
Find the ratio of the average number of phonons in a crystal that have an energy half as large
Maximum, to the average number of phonons with a maximum energy at a temperature of 300 K. Debaevskaya
The temperature of the crystal is 150 K.
Task 4.78
Determine the impurity electrical conductivity of a diamond containing indium at a concentration of 5 × 1021 m-3 and
Antimony with a concentration of 2 • 1021 m-3. The mobility of electrons and holes for a diamond is, respectively,
0.18 and 0.12 m2 / (B · s).