Task 4.7
Calculate the de Broglie wavelength of an electron that has passed the accelerating potential difference 511
KV.

Task 4.17
What is the minimum uncertainty of the photon coordinate corresponding to the visible radiation
With a wavelength of 0.55 μm.
Task 4.27
The particle is in an infinitely deep one-dimensional potential well of width l in the first
Excited state. At what points of the well are the probability density of particle detection
Maximum, and in what - minimal.

Task 4.37
Calculate the largest and smallest wavelengths of the K-series of the characteristic X-ray
Radiation from platinum anti-cathode.

Task 4.47
During what time does 87.5% of 4520 Ca atoms disintegrate?
Task 4.57
Calculate the energy of the nuclear reaction n + 105 B-> 73Li + 42He.
Task 4.67
Determine the maximum energy of a phonon in a crystal whose Debye temperature is 200 K.
How many phonons with maximum energy are excited on average at a temperature of 300 K.
Task 4.77
Determine the impurity electrical conductivity of a diamond containing boron with a concentration of 2 × 1021 m-3 and
Arsenic with a concentration of 1 • 1021 m-3. The mobility of electrons and holes for a diamond is, respectively,
0.18 and 0.12 m2 / (B · s).