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 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 ? answer in the format of a.bc x
10de Hz
b) A photoelectric cell is illuminated with white light
(wavelengths from 400 nm to 700 nm). What is the maximum kinetic
energy (in eV) of the electrons emitted by this surface if its work
function is 2.30 eV ? 4 digit answer

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...

a) What is the energy of a photon (in eV) that has a wavelength
of 466 nm? (3 digit answer)
b) What is the energy (in eV) of a photon that has a wavelength
of 460 nm?
c) What is the wavelength of a photon that has 2.1 eV of kinetic
energy? (format of a.b x 10-c m )
d) a photoelectric surface has a work function of 2.00 eV. What
is the threshold frequency of this surface? (format of
a.bc...

5. The light of frequency 8.9 x 10^14 Hz falls on a
photoelectric surface. When the retarding potential of 0.85 V is
applied, the maximum speed with which an electron reaches the
collector plate is 4.9 x 10^5 m/s. Find:
a) the maximum kinetic energy( in joules) of an electron as it
leaves the photoelectrode
b) the work function (in eV) of the photoelectrode
c) the threshold frequency (in Hz) of the photoelectrode

In photoelectric effect, light photon is allowed to fall on a
metal surface and a photoelectron is ejected with kinetic energy
2.6 eV. If the threshold frequency f0 = 2 x 10^14
Hz then calculate the frequency and energy of incident
photon.

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 work function of a particular substance is 5.3 ×
10-19 J. What is the photoelectric cutoff wavelength for
this material? Enter your answer in nm.

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...

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

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