Question

Question 1: Photoelectric effect. An aluminum plate is lit by 30 watt blue light ( = 340nm). The aluminum extraction work is 2 eV. a. What will be the maximum speed of the ejected electrons? b. If only 1% of the ejected electrons go to the detector, how much will it detect per second? c. What is the stopping potential? d. What maximum wavelength can the photoelectric effect produce on aluminum?

Answer #1

A) Within a photoelectric effect experiment, light shines on the
surface of a metal plate and the stopping voltage is
measured.
a) If the light intensity is decreased, what happens to the
stopping voltage?
decreases
increases
stays the same
not enough information
b) If the light intensity is decreased, what happens to the number
of electrons emitted?
decreases
increases
stays the same
not enough information
c) If the light wavelength is decreased, what happens to the KE of
the emitted...

What would be the maximum speed of the electrons ejected from a metal plate whose extraction work is 9 eV if it were lit by a light having a wavelength of 100 nm?

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...

The photoelectric work function of potassium is 2.1 eV. If light
that has a wavelength of 180 nm falls on potassium
Part A: Find the stopping potential for light of this wavelength
(V = ______ units)
Part B: Find the kinetic energy, in electron volts, of the most
energetic electrons ejected (K = ______ eV)
Part C: Find the speeds of these electrons (vmax = ______
units)

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)

In a photoelectric experiment, the work function of the material
from which electrons are ejected equals 2.5eV. What is the maximum
wavelength of light for which electrons are ejected from this
material and what stopping voltage is required when light, having a
wave lengthof 3.5x 10-7m, is used with this material(if one may
take for Planck’s constant, h = 6.63 x 10−34Js, for the speed of
light, c = 3.0 x 108m/s, and noting that:1 eV = 1.6 x 10−19J)?

A) You are setting up a photoelectric effect experiment with an
unknown metal surface.
Which of the following wavelengths of light is most likely to
cause electrons to be ejected from the surface?
700 nm
they are all equally likely to work
500 nm
300 nm
900 nm
B) Suppose you try the experiment with the light you chose in
the previous question, and you get ejected electrons with a maximum
kinetic energy of 2.5 eV. What will happen if...

a) A photon of wavelength 43 nm is incident upon a metal in a
photoelectric apparatus. A stopping voltage of 21 V was obtained.
What is the threshold frequency of the metal? (format of a.b x
10cdHz)
b) Light with a frequency of 5.00 x 1014 Hz
illuminates a photoelectric surface that has a work function of
2.10 x 10-19 J. What is the maximum kinetic energy of
the emitted photoelectrons? (format of a.bc x 10-de J
)
c) Light...

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.

An experimental is conducted to investigate the
photoelectric effect with a Barium plate. When the wavelength of
the incident light is less than 500.0 nm the plate starts emitting
electrons.
a) what is the threshold frequency of the Barium plate?
b) what is the work function of Barium?
The wavelength of the incident light is charged to 300.0 nm.
c) what is the kinetic energy of the photoelectrons?

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