Question

a) A photoelectric surface has a work function of 3.30 x 10-19 J. What is the threshold frequency of this surface? (format of a.bc x 10de Hz)

b) What is the stopping voltage of an electron that has 5.40 x
10^{-19} J of kinetic energy? (3 digit answer)

c) A photoelectric surface requires a light of maximum wavelength of 675 nm to cause electron emission. What is the work function (in eV) of this surface? (3 digit answer)

d) A photoelectric surface has a work function of 2.75 eV. What
is the minimum frequency of light that will cause photoelectron
emission from this surface? (format of a.bc x 10^{de}
Hz)

e) A photon of frequency 8.2 x 10^{15} Hz is incident
upon a photoelectric apparatus containing a metal whose threshold
frequency is 3.6 x 10^{15} Hz. What is the stopping
voltage? (2 digit answer)

Answer #1

a) A photon with a wavelength of 3.00x10-7 m strikes
an electron at rest. The scattered photon has a wavelength of
4.00x10-7 m. Calculate the KE of the electron.
b) 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 the ejected electron?
c) A photon of wavelength 43 nm is incident upon a metal in a
photoelectric apparatus. A stopping voltage of 21...

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...

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)

Sodium has a work function of 2.46 eV.
(a) Find the cutoff wavelength and cutoff frequency for the
photoelectric effect.
wavelength
_________ nm
frequency
_________ Hz
(b) What is the stopping potential if the incident light has a
wavelength of 168 nm?
_________________V

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.

The work function of a certain metal is 6.6 eV. When a photon
whose frequency is 2.80 x 1015 Hz is absorbed by an electron below
the surface, the electron escapes the surface with 3.5 eV of
kinetic energy. How much energy (in eV) did the electron use to
reach the surface?
a) 1.59
b) 4.22
c) 1.50
d) 3.62
None of these

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...

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

Two light sources are used in a photoelectric experiment to
determine the work function for a particular metal surface. When
green light from a mercury lamp (λ = 546.1 nm) is used, a
stopping potential of 0.954 V reduces the photocurrent to zero.
(a) Based on this measurement, what is the work function for
this metal?
eV
(b) What stopping potential would be observed when using light from
a red lamp (λ = 628.0 nm)?
V

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?

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