Question

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??

Answer #1

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

The work function for a metal is 5.58 eV. What is the threshold
(minimum) wavelength of incident photons for the photoelectric
effect?

Two light sources are used in a photoelectric experiment to
determine the work function for a particular metal surface. When
green light from a mercury lamp (λ = 546.1 nm) is used, a
stopping potential of 0.954 V reduces the photocurrent to zero.
(a) Based on this measurement, what is the work function for
this metal?
eV
(b) What stopping potential would be observed when using light from
a red lamp (λ = 628.0 nm)?
V

A certain metal has a work function of 2.6 eV. (a) What is the
shortest wavelength of the electromagnetic radiation that will
eject electrons from this material? (b) If light of wavelength 420
nm is used, what will be the speed of the emitted electrons?

In a photoelectric experiment using a CalciumCalcium surface,
you find a stopping potential of 0.71 V for a wavelength of 347 nm
and a stopping potential of 2.86 V for a wavelength of 217
nm.
Because this is an experiment, your value of Planck's constant will
be slightly different from the official value.
From these data find
a) a value for Planck's constant h
__________________×10−34J⋅s
b) the work function for CalciumCalcium
eVeV
c) the cutoff wavelength for this metal

The stopping potential for electrons emitted from a surface
illuminated by light of wavelength 567 nm is 0.932 V. When the
incident wavelength is changed to a new value, the stopping
potential is 2.00 V.
(a) What is this new wavelength?
(b) What is the work function for the surface

The stopping potential for electrons emitted from a surface
illuminated by light of wavelength 500 nm is 0.770 V. When the
incident wavelength is changed to a new value, the stopping
potential is 1.40 V. (a) What is this new
wavelength? (b) What is the work function for the
surface?

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...

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.

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