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.

Consider a beam of light with a wavelength λ = 403-nm incident
onto a metal surface, which can be Li, Be or Hg. The work functions
of these metals are 2.30-eV, 3.90-eV and 4.50-eV respectively. For
the metal that exhibits the photoelectric effect find the maximum
kinetic energy of the photoelectrons.

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.

Ultraviolet light of wavelength 350 nm is directed at a
potassiums surface. The work function of potassiums is 2.2
eV.
a) Calculate the maximum energy of photoelectrons in units of
eV.
b) Explain why x-ray is not used in the photoelectric
effect.

When monochromatic light of an unknown wavelength falls on a
sample of silver, a minimum potential of 2.55 V is required to stop
all of the ejected photoelectrons. (The work function for silver is
4.73 eV.)
HINT
(a)
Determine the maximum kinetic energy (in eV) of the ejected
photoelectrons.
eV
(b)
Determine the maximum speed (in m/s) of the ejected
photoelectrons.
m/s
(c)
Determine the wavelength in nm of the incident light.
nm

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