Question

a beam of photons strikes a photoelectric cell with a work function of 2.5 eV, causing electrons to be emitted. The electrons hit a cathode which completes a circuit with the cell. The total resistance of the circuit is 4 ohm and an anmeter measures a current of 5A. what is the energy of the photons striking the photoelectric cell?

if light with a frequency of 1*10^15 hz falls on the sodium in the previous problem, what is the maximum kinetic energy of the photoelectrons?

Answer #1

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) 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

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...

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 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)

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
useful constant: hc = 1240 eVnm.)
Tries 0/99
3. Calculate the kinetic energy of the emitted electrons if the
frequency of the photons is doubled to 2f0.

Copper has a work function of 4.70 eV, a resistivity of
1.7x10-8Ω∙m, and a temperature coefficient of 3.9 x10-3ºC -1.
Suppose you have a cylindrical wire of length 2.0manddiameter 0.50
cm connected to a variable power source; and separate thin,square
plate of copper.
a.(5points) Draw a clear physics diagram showing each part of
the problem.
b.(5points)At what temperature would the wire have 2.5 times the
resistance that it has a t 20degrees?
c.(5 points) What is the peak wavelength of...

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