Question

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?

539nm

658nm

392nm

156nm

1445nm

none of the above

Answer #1

In photoelectric effect, maximum kinetic energy of the photoelectron is given by

where is the work function of the metal.

Substituting the values ,

where

Hence the required wavelength is

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

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

The maximum speed of photoelectrons ejected from the surface of
copper is 4.07E5 m/s when light with a wavelength of 240 nm is
shined on the surface. What is the work function of copper
metal?

A metal surface has a work function of 3.18 eV. Determine
whether photoelectrons are ejected or not and if so, calculate
their maximum kinetic energy, when the surface is illuminated by
light of wavelength of
(a) 310 nm and (b) 460 nm.

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.)

Monochromatic light from laser shines onto an aluminium surface
and produces photoelectrons with maximum kinetic energy KEmax =
1.02 eV. What is the wavelength of the laser light? What is the
maximum velocity of the photoelectrons? Assume a work function of
4.06 eV for aluminium.

The work function for aluminum is 4.2 eV. (a) What is the cutoff
frequency of light
incident on an aluminum target that releases photoelectrons from
its surface? (b) Find the
corresponding cutoff wavelength. (c) If photons of energy 5.0 eV
are incident on an
aluminum target what is the maximum kinetic energy of the ejected
photoelectrons? (d)
what is the maximum velocity of a photoelectron traveling from the
anode to the cathode
of a photocell? (d) If a blue beam...

The work function for aluminum is 4.2 eV. (a) What is the cutoff
frequency of light
incident on an aluminum target that releases photoelectrons from
its surface? (b) Find the
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are incident on an
aluminum target what is the maximum kinetic energy of the ejected
photoelectrons? (d)
what is the maximum velocity of a photoelectron traveling from the
anode to the cathode
of a photocell? (d) If a red laser...

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