Photoelectric Effect Questions 1
1. Sodium has a work function of 2.3 eV. Calculate:
a. the threshold frequency
b. the maximum kinetic energy available for the photoelectrons if illuminated by light
of wavelength λ = 5 x 10-7 m
c. the maximum velocity of the photoelectrons (electron mass = 9.11 x 10-31 kg)
2. Calcium has a work function of 2.7 eV. Calculate:
a. the work function of calcium expressed in joules
b. the threshold frequency for calcium
c. the maximum wavelength that will cause emission from calcium
3. Gold has a work function of 4.9 eV. Calculate:
a. maximum kinetic energy in joules of the electrons emitted when gold is illuminated
with UV radiation of frequency 1.7 x 1015 Hz
b. the energy expressed in eV
Element
Work function (eV)
Aluminium
4.08
4. Light of wavelength 296 nm is used to illuminate the
metals listed in the table. Which of these metals will
Calcium
2.7
release photoelectrons? For each metal, what is the
Copper
4.7
maximum kinetic energy that the released photons
Gold
4.9
could have?
Magnesium
3.68
Zinc
4.3
Photoelectric Effect Questions 1
1. Sodium has a work function of 2.3 eV. Calculate:
a. the threshold frequency
b. the maximum kinetic energy available for the photoelectrons if illuminated by light
of wavelength λ = 5 x 10-7 m
c. the maximum velocity of the photoelectrons (electron mass = 9.11 x 10-31 kg)
2. Calcium has a work function of 2.7 eV. Calculate:
a. the work function of calcium expressed in joules
b. the threshold frequency for calcium
c. the maximum wavelength that will cause emission from calcium
3. Gold has a work function of 4.9 eV. Calculate:
a. maximum kinetic energy in joules of the electrons emitted when gold is illuminated
with UV radiation of frequency 1.7 x 1015 Hz
b. the energy expressed in eV
Element
Work function (eV)
Aluminium
4.08
4. Light of wavelength 296 nm is used to illuminate the
metals listed in the table. Which of these metals will
Calcium
2.7
release photoelectrons? For each metal, what is the
Copper
4.7
maximum kinetic energy that the released photons
Gold
4.9
could have?
Magnesium
3.68
Zinc
4.3