Question

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.

Answer #1

The maximum kinetic energy of photoelectrons is 3.10 eVeV . When
the wavelength of the light is increased by 50%, the maximum energy
decreases to 1.10 eVeV .
Part A
What is the work function of the cathode?
Part B
What is the initial wavelength ?

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

Photoelectrons are ejected when monochromatic light shines on a
sodium surface. In order to obtain the maximum increase in the
number of electrons ejected per second, the experimenter needs
to
a. increase the frequency of the light.
b. increase the intensity of the light.
c. increase the area illuminated by the light.
d. do all of the above.
e. do only (b) and (c) above.
** Brief Explanation Please.

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

1. Light of wavelength 401 nm incident on a certain metal
produces photoelectrons with a maximum kinetic energy of 1.78 eV.
What is the maximum wavelength of light capable of producing
photoelectrons for this metal?
2. Electrons in an electron microscope have been accelerated
through a potential difference of 1250 V. How large is their de
Brogile wavelength?

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.)

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.

monochromatic light with a frequency of 1.54*10^15 hz
is shone onto the surface of tin. the total energy of the light
shone is 1.02*10^-11j. what is the maximum number of electrons that
can be ejected?how much kinetic energy does each ejected electron
have?

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

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