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

Light of wavelength 270 nm strikes a metal whose work function
is 1.9 eV. What is the shortest de Broglie wavelength for the
electrons that are produced as photoelectrons?

Light of wavelength 300 nm strikes a metal whose work function
is 2.0 eV.
What is the shortest de Broglie wavelength for the electrons
that are produced as photoelectrons?
Express your answer using two significant figures.
λmin=
m

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.
A) The element rubidium has a work function of 2.16 eV. What is
the maximum kinetic energy of electrons if the metal is illuminated
by light of wavelength 198 nm?
B) What is their speed?
2.
What wavelength light would have to fall on the metal tungsten
(work function 4.55 eV) if it is to emit electrons with a maximum
speed of 1.02x106 m/s?

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 metal has a work function 2.78eV. Photons of a certain
wavelength incident on this metal produce electrons with a maximum
kinetic energy 2.33eV. Determine the wavelength of the incident
photons (in nm).

1)A magnesium surface has a work function of 2.65 eV.
Electromagnetic waves with a wavelength of 280 nm strike the
surface and eject electrons. Find the maximum kinetic energy of the
ejected electrons. Express your answer in electron volts.
Ans in eV
2)What is the energy of each of the two photons produced in an
electron-positron annihilation?
Use the following Joules-to-electron-Volts conversion 1eV = 1.602 ×
10-19 J.
The rest mass of an electron is 9.11×10^-31 kg.
Ans in MeV

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

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