Question

The hydrogen emission spectrum produces light at 430 nm (blue), 480 nm (blue-green) and 650 nm (red).

Find the energy in Joules and then in eV for a photon at each of these wavelengths:

430 nm:

480 nm:

650 nm:

A metal surface has a work function (W_{0}) of 2.7
eV. Of the three wavelengths of light in the hydrogen
spectrum, which would be able to release electrons from the metal
surface?

Calculate the kinetic energy in eV if any, of the electron freed by a photon of 430 nm wavelength. If no electron is released enter zero.

Answer #1

Will a photon of light of wavelength 480 nm excite an electron
in the hydrogen atom from the n=1 level to the n=2 level?
Explain

An orange emission line is observed at 656.3 nm in the hydrogen
emission spectrum. Determine the initial energy level of the
electron.

Light of wavelength 342 nm shines on a metal surface and the
stopping potential V0 in a photoelectric experiment is observed to
be 0.850 V.
a) What is the work function φ of the metal? (eV)
b) What is the maximum kinetic energy of the ejected electrons
(in Joules)?
c) What is the longest wavelength light that will still allow
electrons to escape the metal?(nm)

(1)
Part A: If a electron in a hydrogen atom makes a transition from
ground state to n = 8 level what wavelength of light in (nm) would
be needed for the abosorbed photon to cause the transition?
Part B: If the same electron falls to a lower level by emmitting
a photon of light in the Paschen series what is the frequncy of
light in (Hz) thats emitted?
(2) When a photon have a wavelength of 195nm strikes the...

Consider a laser pointer that emits red light with wavelength
650 nm. This light is used for a photoelectric effect experiment
where the anode in the evacuated glass tube is made up of a
material that has work function equal to 1 eV.
[1] What is the energy of an individual photon that comes out of
the laser pointer?
[2] What is the maximum kinetic energy of an emitted
electron?

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?

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...

2a) When a metal surface is illuminated by light of wavelength
310 nm, the
measured maximum kinetic energy of the emitted electrons is 0.50
eV. Calculate the
metal plate’s work function φ in units of eV.
b) In the rest frame of an ejected electron from the photoelectric
experiment in part a),
an incident γ-ray with an energy of 0.25 MeV interacts with the
electron. Following
the collision, the γ-ray has a final energy of 0.1 MeV. Calculate
the angle...

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

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...

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