3.3 While sitting in front of a colour TV screen with a 25 kV picture tube potential you have an excellent chance of being irradiated with X-rays. (h = 6.6 x 10-34 Js, c = 3.0 x 10° m/s, 1 ev – 1.6 x 1019 J). Calculate the shortest wavelength (maximum energy) X- ray.

What minimum accelerating voltage would be required to produce an x-ray with a wavelength of 0.0260 nm? V = kV

Ex. 48: The ultraviolet light of wavelength 3333 A is incident on a metal having work function 2 eV. What is the stopping potential for the metal ? Given e = 1.6 × 10-1⁹ C, c = 6.63 x 10-34 Js, c = 3 x 108 m/s

Light of wavelength 196 nm shines on a metal surface. 3.77 eV is required to eject an electron. What is the kinetic energy of (a) the fastest and (b) the slowest ejected electrons? (c) What is the stopping potential for this situation? (d) What is the cutoff wavelength for this metal? (a) Number i Units (b) Number i Units (c) Number Units (d) Number i Units

A beam of 840 eV alpha particles (m=6.64x10-27kg) scatters from the atoms that have spacing 0.0834 nm in the surface plane of a crystal. At what angle does the m=1 intensity maximum occur?

A clean nickel surface is exposed to light whose wavelength is 235 Nm. What is the maximum speed of the photons electrons emitted from this surface? Use Table 38.1

Energy changes of -1.8167 x 10-19 is recorded when an electron jump from n=6 in an unknown series of hydrogen line spectra. a) calculate the value of nf- [ RH = 2.18 x 10-19]b) identify the line spectra for this radiation