Question

The work function for tungsten is 4.58eV. What is the kinetic energy of electrons emitted when light of wavelength 400nm is incident on the tungsten surface? (Planck constant= 6.626 x10^-34 J s= 4.136 x10^-15 eVs)

A. 0.74eV

B.1.5eV

C. 7.7eV

D. 2.9eV

E. No electrons are emitted

Answer #1

The maximum kinetic energy of the emitted electrons is found to
be 1.255 eV when a metal surface is illuminated by light with a
wavelength of 400 nm. When the same metal surface is illuminated by
light with a different wavelength, the maximum kinetic energy of
the emitted electrons is found to be 0.634 eV. What is the
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When light of wavelength 300.0 nm is incident on potassium, the
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A) Calculate the work function for potassium.
B) Calculate the stopping potential if the incident light,
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C) Now, assume that the incident light has an intensity of 0.01
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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...

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
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Tries 0/99
3. Calculate the kinetic energy of the emitted electrons if the
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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

If the work function of a material is 2.20 eV, what frequency of
incident light would give a maximum kinetic energy of 0.25 eV to
the photoelectrons ejected from the surface of this material? (1 eV
= 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)
5.92 × 1014 Hz
3.53 × 1014 Hz
1.02 × 1014 Hz
2.50 × 1014 Hz
2.05 × 1014 Hz

what is the kinetic energy of the emitted electrons
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A lot of blackbody irradiation emanates from the surface of the
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E = hν =
hcλ
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Calculate the energy (in joules) of each photon that is emitted
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The stopping potential for electrons emitted from a surface
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incident wavelength is changed to a new value, the stopping
potential is 2.00 V.
(a) What is this new wavelength?
(b) What is the work function for the surface

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