Question

When ultraviolet light with a wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is 1.10 eV .

What is the maximum kinetic energy *K*0 of the
photoelectrons when light of wavelength 330 nm falls on the same
surface?

Use ** h** =
6.63×10

Answer #1

maximum kinetic energy of an ejected electron

Kmax = hc/1 - W

so work function

W = hc/1 - Kmax

W = [ 6.63*10^{-34} *3*10^{8} /
400*10^{-9} ] - [1.10*1.6*10^{-19} ]

W = 4.97*10^{-19} - 1.76*10^{-19}

W = 3.21*10^{-19} J

Now

Maximum kinectic energy of an ejected electron

Kmax = hc/2 - W

Kmax = [ 6.63*10^{-34} *3*10^{8} /
330*10^{-9} ] - [3.21*10^{-19} ]

Kmax = 2.81*10^{-19} J

Kmax = 2.81*10^{-19} /1.6*10^{-19} eV

Kmax = 1.75 eV

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K_0 of the photoelectrons
when light of wavelength 340 nm falls on the same surface?
Use h = 6.63×10−34 J⋅s for Planck's constant and c =
3.00×108 m/s for the speed of light and express your
answer in electron volts.
View Available Hint(s)
K_0 =
eV

When ultraviolet light with a wavelength of 400 nmfalls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 350 nm falls on the same
surface?
Use h = 6.63×10?34 J?s for Planck's constant
and c = 3.00×108 m/s for the speed of light and
express your answer in electron volts.

When ultraviolet light with a wavelength of 400 nmnm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eVeV .
What is the maximum kinetic energy K0K0K_0 of the
photoelectrons when light of wavelength 270 nmnm falls on the same
surface?
Use hhh = 6.63×10−34 J⋅sJ⋅s for Planck's constant and
ccc = 3.00×108 m/sm/s for the speed of light and express
your answer in electron volts.

When ultraviolet light with a wavelength of 262 nm falls upon a
clean metal surface, the stopping potential necessary to terminate
the emission of photoelectrons is 0.172 V .What is the
photoelectric threshold wavelength for this metal? What is the work
function for the metal?

When a monochromatic ultraviolet light with a wavelength of 254
nm falls onto the surface of a particular metal it causes a
photocurrent to flow. A stopping voltage of 2.30 V is required to
totally block the photocurrent.
a. What is the work function of the material?
W = _______ eV
b. What is the cutoff wavelength for this metal?
λ = ________ nm
c. Will light with a wavelength of 523 nm be able to cause a
photocurrent from...

1. An ultraviolet light with wavelength 380 nm and intensity
1.00 W/m2 falling on 1.00 cm2 area of Lithium surface. If 0.9 % of
the incident photons produces photoelectrons, how many photons
emitted per second.
2.Calculate maximum kinetic energy of ejected photoelectron when
320 nm light falls on Silver surface.

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
any emitted photoelectrons?

1. Light of wavelength 401 nm incident on a certain metal
produces photoelectrons with a maximum kinetic energy of 1.78 eV.
What is the maximum wavelength of light capable of producing
photoelectrons for this metal?
2. Electrons in an electron microscope have been accelerated
through a potential difference of 1250 V. How large is their de
Brogile wavelength?

You illuminate a metal with light of wavelength 590 nm and find
that the photoelectrons have a maximum kinetic energy of 0.70 eV.
You then illuminate the same metal with light of another wavelength
and find a maximum kinetic energy of 1.9 eV for the
photoelectrons.
What is the second wavelength, in nanometers?

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?

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