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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Answered: Potassium and gold cathodes are used in…

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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1%Vr I. : 2 / life physics que... -> ở: choice the correct answer 1. If 5000 Joules of energy are released in a 100mA, 1 second exposure, the tube potential is a. 5KV b. 50 KV c. 500 KV d. 5000 KV 2. If the wavelength of green light is 5 x 10 cm, its velocity in a vacuum is a. 3x10° cm's b. 4.13x101 cm/ s c. 3.14x104 cm's d. not found 3. Which of the following has the least wavelength? a. Gamma rays, b. blue light, c infrared radiation d. ultraviolet, radiation 4. the light travel --------- path a. rectilinear b. zigzag c. circular d. helical 5. The wavelength of light visible to eye is of the order of a. 10 m b. 10" m с. 1 m d. 6x10'm g: the thickness of shielding material is 2cm required to reduce the intensity of radiation to half of its original intensity. What is value absorption coefficient. O': calculate the number of expected cancer cases if the cancer ratio is 6.5 x102 Sv Personal of 10 years 20 20 28 30 15 H 18 10 8 5 Lecturer: Dr.bager alnashy II
According to quantum mechanics all objects have a wavelength related to their momentum. What is the de Broglie wavelength of an electron that has been accelerated from rest through a potential of 2500V? Select one: a. 0.346 angstroms. b. 5.63 x 10-14 m. c. 0.245 angstroms. d. 0.173 angstroms.
Determine the maximum wavelength of thephoton that hydrogen in the excited stateni = 6 can absorb. The energy of the groundstate of hydrogen is −13.6 eV, the speed oflight is 2.99792 × 108 m/s and Planck’s constant is 6.62607 × 10−34 J · s.Answer in units of nm. What would be the next smaller wavelengththat would work?Answer in units of nm.
2. Solve the de Broglie wavelength of: a. a tennis ball of mass 57 g traveling 25 m/s b. an electron with kinetic energy 50 eV. 3. Find the de Broglie wavelength of a 1.00-MeV proton. Is a relativistic calculation needed?
a.) Find the frequency in Hertz of radiation with energy of 2.179 x 10-18 J per photon. b.) What frequency of light would be needed to make an electron in a Hydrogen atom jump from n=1 to n=3? c.) A spectral line is measured to have a wavelenght of 1000nm. Is this within the Balmer series?
A certain X-ray photon has energy of 6.2 keV. Calculate its frequency. [Take h = 6.63 x 10 - 34 Js; c = 3.0 x 10 8 m/s; 1eV = 1.6 x 10 - 19 J]. O a. 1.2 x 10 -14 Hz O b. 2.1 x 10 -12 Hz O c. 2.0 x 10 -10 Hz O d. 1.5 x 10 18 Hz
A beam of electrons, a beam of protons, and a beam of oxygen atoms each pass at the same speed through a 1-μm-wide slit. Which will producethe widest central maximum on a detector behind the slit?A. The beam of electrons. B. The beam of protons.C. The beam of oxygen atoms. D. All three patterns will be the same.E. None of the beams will produce a diffraction pattern.
Calculate the wavelength radiated by the hot plate at 537 °C. A.5397 nm O B. 3580 nm OC.1556 nm OD.2347 nm O E. 3247 nm
What is the deBroglie wavelength of a proton that has a kinetic energy of 22.9 MeV? a. 2.40 × 10-21 b. 2.40 × 10-24 , C. 5.99 x 10-12, m d. 5.99 x 10-15 m e. 9.04 × 10-26,
2. In an electron microscope we wish to study particles of diameter about 0.10 um. a. What should be the de Broglie wavelength of the electrons? b. Through what potential difference should the electrons be accelerated to have that de Broglie wavelength?
Calculate the de Broglie wavelength of the following items. m₂ = 9.11 x 10-3¹ kg mp+ = 1.67 x 10-27 kg melephant = 10 tonnes a. an electron travelling at 15 km s-¹? b. an electron with a kinetic energy of 1 eV? c. a proton travelling at 15 km s-¹? d. a proton with a kinetic energy of 1 eV?
4. A photon has energy of 6.60 eV. To what wavelength does this energy correspond?a. 100 nmb. 118 nmc. 151 nmd. 173 nme. 189 nmExplain Your Reasoning, Show Calculation:

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