# Prokofiev VL - the solution of the entire version 08 on

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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.

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.
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.

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?

What proportion of the initial amount of radioactive isotope decays during the lifetime of this
Isotope?
Calculate the energy of the nuclear reaction p + 115 B -> 342 He.
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.