A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV. If a 1.0-V stopping potential is required to make the electron current zero,
what is the wavelength of light? (c = 3.00 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 355 nm
B) 423 nm
C) 497 nm
D) 744 nm
Question 2
When it is struck by 240-nm photons, a material having a work function of 2.60 eV emits electrons. What is the maximum kinetic energy of the emitted electrons?
(c = 3.00 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 2.58 eV
B) 5.18 eV
C) 2.00 eV
D) 4.21 eV
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