Question

Light that has a 192 nm wavelength strikes a metal surface, and photoelectrons are produced moving as fast as 0.002c.

1) What is the work function of the metal? *(Express your
answer to three significant figures.)*

×10^−19J

2) What is the threshold wavelength for the metal above which no
photoelectrons will be emitted? *(Express your answer to three
significant figures.)*

nm

Answer #1

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

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 ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 330 nm falls on the same
surface?
Use h =
6.63×10?34J?s for Planck's constant and
c =
3.00×108m/s for the speed of light and
express your answer in electron volts.

When ultraviolet light with a wavelength of 262 nm falls upon a
clean metal surface, the stopping potential necessary to terminate
the emission of photoelectrons is 0.172 V .What is the
photoelectric threshold wavelength for this metal? What is the work
function for the metal?

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K_0 of the photoelectrons
when light of wavelength 340 nm falls on the same surface?
Use h = 6.63×10−34 J⋅s for Planck's constant and c =
3.00×108 m/s for the speed of light and express your
answer in electron volts.
View Available Hint(s)
K_0 =
eV

When ultraviolet light with a wavelength of 400 nmfalls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 350 nm falls on the same
surface?
Use h = 6.63×10?34 J?s for Planck's constant
and c = 3.00×108 m/s for the speed of light and
express your answer in electron volts.

Light with a wavelength of 425 nm falls on a photoelectric surface
that has a work function of 2.00 eV. What is the maximum speed of
any emitted photoelectrons?

Light whose wavelength is 652nm strikes a meetal surface casuing
the emission of electrons from the surface. The velocity of the
emitted electrons is determined to be 4.1*10^5 m/s. What is the
threshold frequency of the metal?

When ultraviolet light with a wavelength of 400 nmnm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eVeV .
What is the maximum kinetic energy K0K0K_0 of the
photoelectrons when light of wavelength 270 nmnm falls on the same
surface?
Use hhh = 6.63×10−34 J⋅sJ⋅s for Planck's constant and
ccc = 3.00×108 m/sm/s for the speed of light and express
your answer in electron volts.

You illuminate a metal with light of wavelength 590 nm and find
that the photoelectrons have a maximum kinetic energy of 0.70 eV.
You then illuminate the same metal with light of another wavelength
and find a maximum kinetic energy of 1.9 eV for the
photoelectrons.
What is the second wavelength, in nanometers?

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