Question

In: Physics

The work function for metallic Cu is 4.7 eV. Cu is irradiated with 195 nm light....

The work function for metallic Cu is 4.7 eV. Cu is irradiated with 195 nm light. (a) Calculate the kinetic energy, the speed, and the wavelength of electrons ejected due to the photoelectric effect, (b) A 5-watt LED light emits 195 nm light at a Cu film. Calculate the number of electrons emitted per second. Would a 10-watt LED eject more electrons, faster electrons, or both? (c) Find the maximum wavelength of light that could eject electrons from Cu.

For part a, I am confused about finding the wavelength as shouldn't the wavelength just be 195 nm? For part b, can we use the Boltzman equation? If so, would the 5-watt and 10-watt be considered energy levels? I'm still thinking about part c...

Solutions

Expert Solution


Related Solutions

The work function for silver is 4.7 eV. (a) Find the threshold frequency and wavelength for...
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
The work function for lead is 4.14 eV. (a) Find the cutoff wavelength for lead. nm...
The work function for lead is 4.14 eV. (a) Find the cutoff wavelength for lead. nm (b) What is the lowest frequency of light incident on lead that releases photoelectrons from its surface? Hz (c) If photons of energy 5.80 eV are incident on lead, what is the maximum kinetic energy of the ejected photoelectrons? eV
The work function for aluminum is 4.08 eV. (a) What is the cutoff frequency of light...
The work function for aluminum is 4.08 eV. (a) What is the cutoff frequency of light incident on an aluminum target that releases photoelectrons from its surface? (b) Find the corresponding cutoff wavelength. (c) If photons of energy 5.0 eV are incident on an aluminum target what is the maximum kinetic energy of the ejected photoelectrons? (d) what is the maximum velocity of a photoelectron traveling from the anode to the cathode of a photocell? (e) If a blue beam...
The work function for nickel is 5.15 eV. (a) Convert the value of the work function...
The work function for nickel is 5.15 eV. (a) Convert the value of the work function from electron volts to joules. J (b) Find the cutoff frequency for nickel. Hz (c) What maximum wavelength of light incident on nickel releases photoelectrons from the nickel's surface? nm (d) If light of energy 7.12 eV is incident on nickel, what is the maximum kinetic energy of the ejected photoelectrons? Give the answer in electron volts. eV (e) For photons of energy 7.12...
In the photoelectric effect experiment, a light photon with a wavelength λ=525 nm hits a metallic...
In the photoelectric effect experiment, a light photon with a wavelength λ=525 nm hits a metallic cesium (work function = 3.43 ×10−34 J).\ What is the kinetic energy of the photoelectron produced?
Consider a neutral metal with a work function of 2.0 eV ( 1 eV = 1.602...
Consider a neutral metal with a work function of 2.0 eV ( 1 eV = 1.602 10^-19 J). The metal absorbs a photon of wavelength 200 nm. a) Could an electron be ejected? If so, what would the speed of the electron be? b) What is the speed of an electron with a wavelength of 10 nm? c)If we measure the momentum of the electron from part b) to within 1% uncertainty ( p=p = 1% ), what is the...
Photons, electrons and atoms: The work function ( ) of electrons in sodium is 2.28 eV....
Photons, electrons and atoms: The work function ( ) of electrons in sodium is 2.28 eV. b. What total momentum ?(?,) (formula) is transferred to the metal surface when a photon is incident vertically and the photoelectron is emitted in the opposite direction? c. Assume that a (resting) free electron could completely absorb a photon. What wavelength would the photon have to have in order for the momentum balance to be fulfilled in this case as well? Use the so-called...
Cesium has a binding energy (“work function”) of 1.8 eV. When cesium is illuminated with a...
Cesium has a binding energy (“work function”) of 1.8 eV. When cesium is illuminated with a light of a certain wavelength, the electrons ejected from the surface have a kinetic energy of 2.2 eV. What is the wavelength (nm) of the light?
Barium has a work function of 2.48 eV. What is the maximum kinetic energy of electrons...
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
Imagine shooting various colors of light at different kinds of metals. Depending on the work function...
Imagine shooting various colors of light at different kinds of metals. Depending on the work function of each metal, the light will or will not have enough energy to knock of an electron. (a) Which of the following metals will NOT emit electrons when visible light (with wavelengths of 380 nmto 700 nm) shines on them? (b) If visible light can cause the metal to emit electrons, specific if electrons will be emitted when red (685 nm) light is used,...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT