Question

A metal surface has a work function of 3.18 eV. Determine whether photoelectrons are ejected or not and if so, calculate their maximum kinetic energy, when the surface is illuminated by light of wavelength of

(a) 310 nm and (b) 460 nm.

Answer #1

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?

The work function of potassium metal is 2.30 eV. Monochromatic
light is shined on its surface, and photoelectrons with a maximum
speed of 5.50E5 m/s are ejected. What is the wavelength of the
light?
539 nm
657 nm
393 nm
157 nm
1443 nm

2a) When a metal surface is illuminated by light of wavelength
310 nm, the
measured maximum kinetic energy of the emitted electrons is 0.50
eV. Calculate the
metal plate’s work function φ in units of eV.
b) In the rest frame of an ejected electron from the photoelectric
experiment in part a),
an incident γ-ray with an energy of 0.25 MeV interacts with the
electron. Following
the collision, the γ-ray has a final energy of 0.1 MeV. Calculate
the angle...

The maximum speed of photoelectrons ejected from the surface of
copper is 4.07E5 m/s when light with a wavelength of 240 nm is
shined on the surface. What is the work function of copper
metal?

The work function of potassium metal is 2.30 eV. Monochromatic
light is shined on its surface, and photoelectrons with a maximum
speed of 5.50E5 m/s are ejected. What is the wavelength of the
light?
539nm
658nm
392nm
156nm
1445nm
none of the above

The work function for aluminum is 4.2 eV. (a) What is the cutoff
frequency of light
incident on an aluminum target that releases photoelectrons from
its surface? (b) Find the
corresponding cutoff wavelength. (c) If photons of energy 5.0 eV
are incident on an
aluminum target what is the maximum kinetic energy of the ejected
photoelectrons? (d)
what is the maximum velocity of a photoelectron traveling from the
anode to the cathode
of a photocell? (d) If a blue beam...

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?

a) A photon of wavelength 43 nm is incident upon a metal in a
photoelectric apparatus. A stopping voltage of 21 V was obtained.
What is the threshold frequency of the metal? (format of a.b x
10cdHz)
b) Light with a frequency of 5.00 x 1014 Hz
illuminates a photoelectric surface that has a work function of
2.10 x 10-19 J. What is the maximum kinetic energy of
the emitted photoelectrons? (format of a.bc x 10-de J
)
c) Light...

The work function for aluminum is 4.2 eV. (a) What is the cutoff
frequency of light
incident on an aluminum target that releases photoelectrons from
its surface? (b) Find the
corresponding cutoff wavelength. (c) If photons of energy 5.5 eV
are incident on an
aluminum target what is the maximum kinetic energy of the ejected
photoelectrons? (d)
what is the maximum velocity of a photoelectron traveling from the
anode to the cathode
of a photocell? (d) If a red laser...

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
wavelength of this light in nm?

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