Question

- The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 490nm is 0.70V. When the incident wavelength is changed to a new value, the stopping potential is found to be 1.40V. What is the work function for the surface? What is this new wavelength?

Answer #1

The stopping potential for electrons emitted from a surface
illuminated by light of wavelength 567 nm is 0.932 V. When the
incident wavelength is changed to a new value, the stopping
potential is 2.00 V.
(a) What is this new wavelength?
(b) What is the work function for the surface

The stopping potential for electrons emitted from a surface
illuminated by light of wavelength 500 nm is 0.770 V. When the
incident wavelength is changed to a new value, the stopping
potential is 1.40 V. (a) What is this new
wavelength? (b) What is the work function for the
surface?

Photoelectrons are
observed when a metal surface is illuminated by light with a
wavelength 437 nm. The stopping potential for the photoelectrons in
this experiment is 1.67V.
a. What is the work
function of the metal, in eV?
b. What type of metal
is used in this experiment?
c. What is the maximum
speed of the ejected electrons?

consider a metallic surface in vacuum that is being
illuminated with light of different wavelengths. if the metal is
illuminated with light of 360 nm wavelength, electrons can overcome
a (reverse) stopping potential of 1.14V.
a. what is the work function of the metal?
b. if the light wavelength is set to 500nm what will the stopping
potential be?
c. how large is the photocurrent density if the metal is
illuminated with light of 600nm wavelength at a light intensity...

When light of wavelength 323 nm falls on a potassium surface,
electrons are emitted that have a maximum kineticenergy of 1.60 eV.
Find the work function for potassium.
Answer: 2.24 eV
What is the lowest frequency of light that will produce
photoelectrons from potassium?
(in Hz)

Problem: Light strikes a sodium surface, causing photoelectric
emission. The stopping potential for the ejected electrons is 5.0V,
and the work function of sodium is 2.2eV. What is the wavelength of
the incident light? Give your answer in nanometers.

Light of wavelength 235 nm is incident on Magnesium in a
photoelectric effect experiment. The work function of Magnesium is
3.68 eV.
(a) What is the maximum kinetic energy of the emitted electrons,
in eV?
(b)What is the maximum velocity of the emitted electrons, in
m/s?
(c) What is the stopping potential, in Volts, that results in no
collected photoelectrons?
(d) Light of wavelength 235 nm is now incident on lead (work
function 5.40 eV). What is the maximum kinetic...

When ultraviolet light with a wavelength of 262 nm falls upon a
clean metal surface, the stopping potential necessary to terminate
the emission of photoelectrons is 0.172 V .What is the
photoelectric threshold wavelength for this metal? What is the work
function for the metal?

Light that has a 192 nm wavelength strikes a metal surface, and
photoelectrons are produced moving as fast as 0.002c.
1) What is the work function of the metal? (Express your
answer to three significant figures.)
×10^−19J
2) What is the threshold wavelength for the metal above which no
photoelectrons will be emitted? (Express your answer to three
significant figures.)
nm

Light of wavelength 342 nm shines on a metal surface and the
stopping potential V0 in a photoelectric experiment is observed to
be 0.850 V.
a) What is the work function φ of the metal? (eV)
b) What is the maximum kinetic energy of the ejected electrons
(in Joules)?
c) What is the longest wavelength light that will still allow
electrons to escape the metal?(nm)

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