A beam of wavelength 310 nm from a laser is incident on a metal
with work function 2.7 eV. The power of the laser is 0.15 W.
(a) Does the metal emit photoelectrons? Why?
(b) What is the range of photoelectron kinetic energies emitted
by metal?
(c) What is the range of de Broglie wavelengths of these
photoelectons?
(d) How does result for part (b) change if the laser power is
doubled to 0.30 W?
Thank you.
When light of wavelength 400 nm is incident on a metal surface,
the stopping
potential of the photoelectrons is 0.600 V.
a. What is the work function of the metal?
b. What is the threshold frequency?
c. What is the maximum kinetic energy of the electron?
When light with a wavelength of 247 nm is incident on a certain
metal surface, electrons are ejected with a maximum kinetic energy
of 2.84 × 10-19 J. Determine the wavelength (in nm) of
light that should be used to double the maximum kinetic energy of
the electrons ejected from this surface.
A laser of wavelength 200 nm is incident on a metal surface,
which causes the ejection of electrons. The stopping potential is
measured to be 1.66 V.
Use the table below to identify the metal.
Copper
Sodium
Aluminum
Iron
Tungsten
When light with a wavelength of 215 nm is incident on a certain
metal surface, electrons are ejected with a maximum kinetic energy
of 3.33 × 10 − 19 J. Determine the wavelength of light that should
be used to quadruple the maximum kinetic energy of the electrons
ejected from this surface.
A light source of wavelength λ illuminates a metal and
ejects photoelectrons with a maximum kinetic energy of 1.12 eV. A
second light source of wavelength λ/2 ejects
photoelectrons with a maximum kinetic energy of 3.60 eV. What is
the work function of the metal?
____ eV
What is the wavelength of the maximum absorbance of the
nanoparticles? To what colour of visible light does this
correspond? Estimate a size for the gold nanoparticles formed.
The work function for silver is 4.7 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 silver.
Hz
nm
(b) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 180 nm.
eV
(c) Find the maximum kinetic energy of the electrons if the
wavelength of the incident light is 240 nm.
eV
Barium has a work function of 2.48 eV. What is the maximum
kinetic energy of electrons if the metal is illuminated by UV light
of wavelength 420 nm?
eV
What is their speed?
m/s