Question

The emission wavelength of such a scintillator lies between 275 nm and 450 nm and the light yield per neutron is reported to be 20000 photons/MeV neutron energy. Now, you are asked to help design a new photodetector, which receives the light emitted from that scintillator.

What is the maximum kinetic energy of electrons emitted from the photo cathode, given the emission wavelength range of the scintillator?

Answer #1

The emission wavelength of such a scintillator lies between 275
nm and 450 nm and the light yield per neutron is reported to be
20000 photons/MeV neutron energy. Now, you are asked to help design
a new photodetector, which receives the light emitted from that
scintillator. What largest work function of a material used for a
photo cathode would be acceptable that still allows detection of an
emission originating from the scintillator?

The emission wavelength of such a scintillator1 lies between 275
nm and 450 nm and the light yield per neutron is reported to be
20000 photons/MeV neutron energy. Now, you are asked to help design
a new photodetector, which receives the light emitted from that
scintillator.
How much charge is being generated per single neutron, assuming
a 3 MeV neutron and a photon-to-electron conversion efficiency
(quantum efficiency) of 15%? Would this charge be detectable if you
use an Electrometer2 that...

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...

The hydrogen atomic emission spectrum includes a UV line with a
wavelength of 92.323 nm. Photons of this wavelength are emitted
when the electron transitions to nf = 1 as the final
energy state. Show all steps and round answers to correct sig
figs.
a) Is this line associated with a transition between different
excited states or between an excited state and the ground
state?
b) What is the energy of the emitted photon with wavelength
92.323 nm?
c) What...

Light of wavelength 235 nm is incident on Magnesium in a
photoelectric effect experiment. The work function of Magnesium is
3.68 eV.
(a) What is the maximum kinetic energy of the emitted electrons,
in eV?
(b)What is the maximum velocity of the emitted electrons, in
m/s?
(c) What is the stopping potential, in Volts, that results in no
collected photoelectrons?
(d) Light of wavelength 235 nm is now incident on lead (work
function 5.40 eV). What is the maximum kinetic...

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...

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 (W0) 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...

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.

Photons with a wavelength of 440 nm illuminate a metal
surface. There is also a uniform magnetic field of 25 ?T in the
region. Thus, electrons ejected from the metal are bent into
circular arcs with radii ranging from essentially zero up to a
maximum radius of 12 cm.
a) What is the maximum kinetic energy of electrons ejected
from the metal (in eV)?
b) What is the work function of the metal (in eV)?
c) What wavelength of light...

Photons with a wavelength of 440 nm illuminate a metal
surface. There is also a uniform magnetic field of 25 ?T in the
region. Thus, electrons ejected from the metal are bent into
circular arcs with radii ranging from essentially zero up to a
maximum radius of 24 cm.
a) What is the maximum kinetic energy of electrons ejected
from the metal (in eV)?
b) What is the work function of the metal (in eV)?
c) What wavelength of light...

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