Question

1. Does the fact that the speed of light is a definite, predictable quantity conflict with the uncertainty relations?

2. How could you tell if electrons in very distant galaxies obey the Pauli exclusion principle?

3. Calculate the maximum wavelength for the initiation of a photoelectric current in the aluminum (work function W = 4.28 eV). (Answer: 290 nm)

4. An electron in the hydrogen atom drops from the n=5 level to the n=1 level. What are the frequency, wavelength, and energy of the emitted photon? In which series does this photon occur? How much energy must be absorbed by the atom in order to kick the electron back up to the fifth level? (Answer: 95.0nm, 3.16·1015 Hz, 2.09·10-18 J, Lyman, 2.09·10-18 J)

5. The characteristic red light of a He-Ne gas laser is due to stimulated emission between neon levels at 20.66 eV and 18.70 eV. Calculate the wavelength and frequency of the photon emission. (Answer: 634 nm; 4.73·1014 Hz.)

Can you answer the questions and problems(solutions)?

Answer 1

(5) Energy of light emitted by He-Me gas Laser & E=E - Ę where Ei= 20.66 ev E₂ = 1870eu = 20.66ev - 18.70er - 1.96ev E=1.96616x1019 y - 3.136810199 frequency at photch E=hif f = E=3.136*100 Hz 66381034 and Is=4.734104 Ha wavelength of light o=fx = x= & u=c= 3x10fmia of= 4+23x1014 x=34108 - 71коч A = 0.634 x 10m d=634x109 m id=634 nm