Potassium and gold cathodes are used in aphotoelectric-effect experiment. For each cathode,find:1. The threshold frequency.2. The threshold wavelength.3. The maximum electron ejection speedif the light has a wavelength of190 nm.4. The stopping potential if thewavelength is 190 nm.Throughout this problem, be sure to use6.63 × 10-34 J. s for Planck's constant.The threshold frequency of potassium in hertz.Express your answer in hertz.fopotassium=ΜΕ ΑΣΦSubmitRequest AnswerPart BThe threshold frequency of gold in hertz.Express your answer in hertz.fogold=SubmitPart C跖ΜΕ ΑΣΦRequest AnswerThe threshold wavelength of potassium in nanometers.Express your answer in nanometers.Ao potassium=ΜΕ ΑΣΦ???HznmHz

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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4. What is the maximum acceleration potential (V) must be applied to electrons to cause electron diffraction on (220) planes of Lithium at 0 = 5°? (aLi = 3.517A°, m. = 9.1093837015 × 10' kg, q. = 1.6 × 10-19 coulomb, h = 6.62 x 10 34 J.S).
1. A system has a ground state energy of 2 eV. The system is in an excited energy state with 10 eV of energy. If the system transitions from the excited energy state to the ground state by emitting 1 eV photons, how many photons are emitted? a. Exactly 8 b. More than 8 c. More than 1 but less than 8 d. Exactly 1 e. There's no way to know for sure 2. In blackbody radiation, the wavelength that has the peak intensity a. Decreases as temperature increases b. Increases as temperature increases c. Doesn't change as temperature increases
4. A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam?a. 490 V/mb. 840 V/mc. 65 V/md. 120 V/me. 22 V/m
3. Light of wavelength 500. nm is incident on a metallic surface. If the stopping potential for the photoelectric effect is 0.450 V, find (a) the maximum kinetic energy of the emitted electrons, (b) the work function, and (c) the cutoff wavelength. 11
4. In an electron microscope electrons are accelerated by a 1500-V potential drop to a velocity of approximately 1x108 m/s. a) Calculate the de Broglie wavelength of these electrons. b) What size objects should such a microscope be able to visualize? Explain your answer. c) If you desire a minimum uncertainty in the position of the electrons in your microscope of 1 Å, what is the maximum uncertainty that is acceptable in the momentum and velocity of the electrons?..
9. Considering the photoelectric effect; a) If a material has a cutoff wavelength of 780 nm what is the work function of the material? b) What is the maximum speed of liberated electrons when light with a wavelength of 410 nm is used to illuminate the material? If a liberated electron has 3.2349 eV of kinetic energy and it was a photon emitted from a hydrogen atom transition that liberated it, what energy level transition occurred? State both the initial and final energy level.
You set up a photoelectric experiment with an unknown metal to eject electrons. You use light of wavelength λ = 660 nm, which just BARELY ejects electrons from the metal. Planck s constant is either h = 6.63 x 10-34 J.s or h = 4.14 x 10-15 ev.s. a) What is the binding energy of the unknown metal in eV? eV b) You change the light source to one with a wavelength of λ = 300 nm. Using the binding energy you found in the previous step, find the maximum kinetic energy of an electron that is ejected from the metal in Joules. c) What is the stopping voltage for an electron with the kinetic energy you just found? Submit Answer
According to the Bohr model of the atom electrons exist in orbits around the atomic nucleus labelled by a quantum number n. The Bohr radius of an Hydrogen atom is 0.53 angstroms. What is the radius for the n = 3 orbit ? Select one: a. 1.59 angstroms. b. 4.77 angstroms. c. 3.18 angstroms. d. 0.176 angstroms. Clear my choice

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