Answer to Question #61366 in Electricity and Magnetism for bebeji

Question

17) When a copper surface is illuminated by radiation of wavelength 2537 angstrome units the value of the stopping potential is found to be 0.24volts. Calculate the work function of copper.
a) 4.48eV
b) 7.46eV
c) 3.26eV
d) 2.67eV
18) A spectral line is emitted when an atom undergoes transition between two levels with a difference in energy of 2.4eV. What is the wavelength of the line?
a) 287nm
b) 507angstrome units
c) 377angstrome units
d) 518nm