Question

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)

Answer #1

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

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...

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

A photoelectric apparatus is set up with Lead as the target. The
Work Function of Pb is 4.14 eV. A 25 mW laser of various
wavelengths shines on the Pb target. For each wavelength below,
indicate the maximum kinetic energy of ejected electrons and the
current that flows.
wavlength, nm
K, eV
I, A
329
240
114

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 work function of metal is 2.44 eV if the stopping potential
is 2.1 V what is the wavelength of the light shined on metal that
causes photo effect if the wavelength is increased by 50% what
would be the stopping potential in this case for what wavelength is
stopping potential is 0??

When monochromatic light of an unknown wavelength falls on a
sample of silver, a minimum potential of 2.50 V is required to stop
all of the ejected photoelectrons. Determine the (a) maximum
kinetic energy and (b) maximum speed of the ejected photoelectrons.
(c) Determine the wavelength in nm of the incident light. (The work
function for silver is 4.73 eV.)

When monochromatic light of an unknown wavelength falls on a
sample of silver, a minimum potential of 2.50 V is required to stop
all of the ejected photoelectrons. Determine the (a) maximum
kinetic energy and (b) maximum speed of the ejected photoelectrons.
(c) Determine the wavelength in nm of the incident light. (The work
function for silver is 4.73 eV.)

In a photoelectric experiment it is found that a stopping
potential of 1.00 V is needed to stop all the electrons when
incident light of wavelength 262 nm is used and 2.2 V is needed for
light of wavelength 207 nm. From these data determine Planck's
constant and the work function of the metal.
eV·s?
eV?

Part C What will occur if light with a shorter wavelength than
that in part b =( 91.1 nm) is used to excite the hydrogen atom?
What will occur if light with a shorter wavelength than that in
part (b) is used to excite the hydrogen atom?
A) If light with a wavelength shorter than 91.1 nm is used to
excite the H atom, the excess energy will be devided to the kinetic
and potential energy of the ejected electron....

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