Question

A certain metal has a work function of 2.6 eV. (a) What is the shortest wavelength of the electromagnetic radiation that will eject electrons from this material? (b) If light of wavelength 420 nm is used, what will be the speed of the emitted electrons?

Answer #1

The work function for copper is 4.5 eV.
(a) Find the threshold frequency and wavelength for the
photoelectric effect to occur when monochromatic electromagnetic
radiation is incident on the surface of a sample of copper.
Hz
nm
(b) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 190 nm.
eV
(c) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 240 nm.
eV

The work function for gold is 5.01 eV.
(a) Find the threshold frequency and wavelength for the
photoelectric effect to occur when monochromatic electromagnetic
radiation is incident on the surface of a sample of gold. In Hz and
nm
(b) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 160 nm.in eV (
c) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 220 nm. In...

1. The work function of a certain metal is φ = 2.25 eV.
Determine the minimum frequency of light f0 for which
photoelectrons are emitted from the metal. (Planck's constant is: h
= 4.1357×10-15 eVs.)
Tries 0/99
2. Determine the corresponding wavelength of light. (Possibly
useful constant: hc = 1240 eVnm.)
Tries 0/99
3. Calculate the kinetic energy of the emitted electrons if the
frequency of the photons is doubled to 2f0.

A. What is the energy in 10-3 eV of a photon that has
a momentum of 6.13×10−29 kg ⋅ m/s ?
B. What is the energy in 10-9 eV of a photon in a
radio wave from an AM station that has a 1,506 kHz broadcast
frequency?
C. Calculate the frequency in 1020 Hz of a 0.571 MeV
γ-ray photon.
D. A certain molecule oscillates with a frequency of
1.73×1013 Hz. What is the approximate value of
n for a...

A certain metal has a photoelectric work function
value of 318.0 KJ/mol e^-. The metal is irritated with light having
a wavelength of 345.0 nm. What is the maximum possible velocity of
electrons ejected from the surface

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)

A metal alloy has a work function of E0 = 4.2 × 10?19
J. It is irradiated with light of different wavelengths, and the
maximum kinetic energy of ejected electrons is measured. Part A:
What is the maximum kinetic energy of ejected electron when 390-nm
light is used? Part B:vWhat is the maximum electron speed when
390-nm light is used? Part C: Does 750-nm light have enough energy
to eject an electron from the metal?

The maximal light wavelength capable to emit electrons from a
certain metal is 660nm. Now, light of wavelength of400nm incident
on this metal.
What is the maximal kinetic energy (in ev) of the emitted
electrons?

The maximum wavelength that an electromagnetic wave can have and
still eject electrons from a metal surface is 519 nm. What is the
work function W0 of this metal? 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?

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