Question

When a monochromatic ultraviolet light with a wavelength of 254 nm falls onto the surface of a particular metal it causes a photocurrent to flow. A stopping voltage of 2.30 V is required to totally block the photocurrent.

a. What is the work function of the material?

W = _______ eV

b. What is the cutoff wavelength for this metal?

λ = ________ nm

c. Will light with a wavelength of 523 nm be able to cause a photocurrent from this material?

_________ (Yes/No)

Answer #1

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?

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K_0 of the photoelectrons
when light of wavelength 340 nm falls on the same surface?
Use h = 6.63×10−34 J⋅s for Planck's constant and c =
3.00×108 m/s for the speed of light and express your
answer in electron volts.
View Available Hint(s)
K_0 =
eV

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 330 nm falls on the same
surface?
Use h =
6.63×10?34J?s for Planck's constant and
c =
3.00×108m/s for the speed of light and
express your answer in electron volts.

A potassium surface is illuminated by a monochromatic laser
light with a wavelength of 400 nm. Determine the maximum speed of a
photoelectron emitted from this surface if the potassium surface
has a work function of 2.30 eV.
??=9.11×10^−31??
c = 3.0x10^8 m/s
h = 6.63x10^-34 js

When ultraviolet light with a wavelength of 400 nmfalls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 350 nm falls on the same
surface?
Use h = 6.63×10?34 J?s for Planck's constant
and c = 3.00×108 m/s for the speed of light and
express your answer in electron volts.

The work function of potassium metal is 2.30 eV. Monochromatic
light is shined on its surface, and photoelectrons with a maximum
speed of 5.50E5 m/s are ejected. What is the wavelength of the
light?
539 nm
657 nm
393 nm
157 nm
1443 nm

When ultraviolet light with a wavelength of 400 nmnm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eVeV .
What is the maximum kinetic energy K0K0K_0 of the
photoelectrons when light of wavelength 270 nmnm falls on the same
surface?
Use hhh = 6.63×10−34 J⋅sJ⋅s for Planck's constant and
ccc = 3.00×108 m/sm/s for the speed of light and express
your answer in electron volts.

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?

When monochromatic light of an unknown wavelength falls on a
sample of silver, a minimum potential of 2.50 V is required to stop
all of the ejected photoelectrons. Determine the (a) maximum
kinetic energy and (b) maximum speed of the ejected photoelectrons.
(c) Determine the wavelength in nm of the incident light. (The work
function for silver is 4.73 eV.)

When monochromatic light of an unknown wavelength falls on a
sample of silver, a minimum potential of 2.50 V is required to stop
all of the ejected photoelectrons. Determine the (a) maximum
kinetic energy and (b) maximum speed of the ejected photoelectrons.
(c) Determine the wavelength in nm of the incident light. (The work
function for silver is 4.73 eV.)

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