(a) Photoelectrons with a maximum kinetic energy of 7.6eV are emitted from a metal when it...
(a) Photoelectrons with a maximum kinetic energy of 7.6eV are emitted from a metal when it is illuminated by ultraviolet radiation with a wavelength of 1.3×102 nm.
(i) What is the energy of the incident photons in electronvolts?
(ii) What is the wavelength of the radiation (in nanometres) corresponding to the lowest energy photons that can free electrons from the metal?
(iii) How do you explain the fact that, when infrared radiation is shone on this metal, no photoelectrons are emitted? (11 marks)
(b) What is the de Broglie wavelength (in nanometres) of an electron with a kinetic energy of 7.6eV?
Homework Answers
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(a) Photoelectrons with a maximum kinetic energy of 7.6eV are
emitted from a metal when it...
When monochromatic light is incident on a metal surface, the maximum kinetic energy of the photoelectrons...
When monochromatic light is incident on a metal surface, the maximum kinetic energy of the photoelectrons emitted is 3.10 eV. a. Find the wavelength of the photons striking the metal. b. In what region of the electromagnetic spectrum does this wavelength occur? c. Find the maximum velocity of the photoelectrons.
Light with a wavelength of 500 nm is shone on a metal and photoelectrons are produced...
Light with a wavelength of 500 nm is shone on a metal and
photoelectrons are produced with non-zero kinetic energy. Light
with a different wavelength of 450 nm is shone on the same metal.
Which of the following is true?
Light with a wavelength of 500 nm is shone on a metal and photoelectrons are produced with non-zero kinetic energy. Light with a different wavelength of 450 nm is shone on the same metal. Which of the following is true?...
A) Light with a wavelength of 395 nm illuminates a metal cathode. The maximum kinetic energy...
A) Light with a wavelength of 395 nm illuminates a metal cathode. The maximum kinetic energy of the emitted electrons is 0.61 eV. What is the longest wavelength of light that will cause electrons to be emitted from this cathode? B) What is the kinetic energy, in eV, of an electron with a de Broglie wavelength of 2.1 nm?
When photons of wavelength 600 nm are shone onto a particular metal surface the highest energy...
When photons of wavelength 600 nm are shone onto a particular metal surface the highest energy electrons emitted have an energy of 0.4 eV. What will be the maximum energy of electrons emitted when photons of wavelength 400 nm are shone onto the same metal surface?
When ultraviolet light with a wavelength of 400nmfalls on a certain metal surface, the maximum kinetic...
When ultraviolet light with a wavelength of 400nmfalls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is 1.10eV . What is the maximum kinetic energy K0 of the photoelectrons when light of wavelength 270nm falls on the same surface?
9. (15 points) Electrons are emitted from the surface of a metal when it's exposed to...
9. (15 points) Electrons are emitted from the surface of a metal when it's exposed to light. This is called the photoclectric effect. Each metal has a certain threshold frequency of light, below which nothing happens. Right at this threshold frequency, an electron is emitted. The binding energy of a metal is the minimum amount of energy required to remove an electron from the surface of the metal. The binding energy for lithium metal is 279.7 kJ/mol (that is, it...
When sodium metal is illuminated with light of wavelength 420nm, the kinetic energy of the electrons...
When sodium metal is illuminated with light of wavelength 420nm, the kinetic energy of the electrons emitted are found to be 1.04x10-19J. When it is illuminated with a 310 nm wavelength of light, the kinetic energy is 2.704x10-19J. Calculate the value of Planck's constant and find the work function of sodium
Electromagnetic radiation is incident on a metallic surface. Electrons are emitted from the surface when the...
Electromagnetic radiation is incident on a metallic surface. Electrons are emitted from the surface when the wavelength is 450 nm or less. a) What is the work function of the metal? b) What is the maximum kinetic energy of photo-electrons if the incident light has a wavelength of 400 nm? c) What is the stopping voltage required to stop photo-electrons ejected by the plate when the incident light has a wavelength of 300 nm? d)If the stopping voltage is 5...
it is actually 30% more kinetic energy not less incident photons (2) When monochromatic light with...
it is actually 30% more kinetic
energy not less
incident photons (2) When monochromatic light with wavelength 496 nm is incident on a certain photo-sensitive material, photoelectrons are liberated. When violet light with wavelength 400 nm is incident on the same surface, photoelectrons are liberated but with 30% less kinetic energy than before. What is the work function of the photo-sensitive material? photo- electrons photo- sensitive material
of its kinetic energy to its fest citib . An experiment shows that when electromagnetic radiation of wavelength 270 nm falls on an aluminum surface, photoelectrons are emitted. The most energetic...
of its kinetic energy to its fest citib . An experiment shows that when electromagnetic radiation of wavelength 270 nm falls on an aluminum surface, photoelectrons are emitted. The most energetic of these are stopped by a potential difference of 0.406 volts. Use this information to calculate the work function of aluminum in electron volts.
of its kinetic energy to its fest citib . An experiment shows that when electromagnetic radiation of wavelength 270 nm falls on an aluminum surface,...
Light with a wavelength of 500 nm is shone on a metal and
photoelectrons are produced with non-zero kinetic energy. Light
with a different wavelength of 450 nm is shone on the same metal.
Which of the following is true?
Light with a wavelength of 500 nm is shone on a metal and photoelectrons are produced with non-zero kinetic energy. Light with a different wavelength of 450 nm is shone on the same metal. Which of the following is true?...
9. (15 points) Electrons are emitted from the surface of a metal when it's exposed to light. This is called the photoclectric effect. Each metal has a certain threshold frequency of light, below which nothing happens. Right at this threshold frequency, an electron is emitted. The binding energy of a metal is the minimum amount of energy required to remove an electron from the surface of the metal. The binding energy for lithium metal is 279.7 kJ/mol (that is, it...
it is actually 30% more kinetic
energy not less
incident photons (2) When monochromatic light with wavelength 496 nm is incident on a certain photo-sensitive material, photoelectrons are liberated. When violet light with wavelength 400 nm is incident on the same surface, photoelectrons are liberated but with 30% less kinetic energy than before. What is the work function of the photo-sensitive material? photo- electrons photo- sensitive material
of its kinetic energy to its fest citib . An experiment shows that when electromagnetic radiation of wavelength 270 nm falls on an aluminum surface, photoelectrons are emitted. The most energetic of these are stopped by a potential difference of 0.406 volts. Use this information to calculate the work function of aluminum in electron volts.
of its kinetic energy to its fest citib . An experiment shows that when electromagnetic radiation of wavelength 270 nm falls on an aluminum surface,...
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