Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 42, Problem 31SP
To determine
The wavelength of the least energetic photon emitted from iron target that can result in a photoemission.
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A metal surface is illuminated with light of different wavelengths and the corresponding stopping
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A (A) 5581 61566731
V (V)1,05 0,86 0,67
Using the Table, determine the photoelectric threshold wavelength (in Å).
An argon laser emits a beam of light of wavelength 4.88 × 10-7 m, the power in the beam being 100mW. How many photons per second are emitted by the laser? If the beam falls on the cesium cathode of a photocell, what photoelectric current would be observed, assuming 10% of the photons are able to eject an electron?Given that the limiting frequency v0 of cesium is 5.2 × 1014Hz, what reverse potential difference between the cell electrodes is needed to suppress the photocell current?
s) The cutoff frequency of a specific metal is known to be 0.72x1015Hz. During a
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Chapter 42 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
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- What is the longest wavelength of radiation that can eject a hotoelectron from potassium, given the work function of potassium 2.24 eV? Is it in the visible range?arrow_forwardThe binding energy of sodium is 2.28 eV. Calculate the number of photoelectrons ejected from a 1.00 mm^2 area of Sodium metal by 500-nm electromagnetic radiation having an intensity of 1.30 kW/m^2. What power is carried away by the electrons?arrow_forwardLight of wavelength 5.6×10 1° m from a mercury arc falls upon a metallic photocathode, and the least potential difference applied between the anode and the photocathode to prevent photocurrent is 8.9 V. Calculate the photoelectric threshold for the metal in pm. Answer:arrow_forward
- The binding energy of Sodium is 2.28eV. Calculate the number of photoelectrons ejected from a 1.00mm² area of A Sodium metal by 500nm electromagnetic radiation having an intensity of 1.30kW/me. What power is carried away by the electronsarrow_forwarda) Calculate the number of photoelectrons per second ejected from a 0.75 -mm? area of sodium metal by 295 nm EM radiation having an intensity of 1.30 kW/m² (the intensity of sunlight above the Earth's atmosphere). electrons per second b) Given that the binding energy is 2.20 eV, what power is carried away by the electrons? mWarrow_forwardIn an experiment of photoelectric effect, no current flows through the circuit when the voltage across the anode and cathode is -1.70 V. Calculate a) b) If it is illuminated by ultraviolet radiation of frequency 1.70 x 1015 Hz. 5. the work function the threshold wavelength of the metal (cathode) [Ans: 8.55×1019 J, 233 nm]arrow_forward
- Example: Light of frequency of 1.00 x 10¹5 Hz illuminates a sodium surface. The ejected photoelectrons are found to have a maximum kinetic energy of 1.78 eV. Find the threshold frequency for this metal. Given: Solution: KEmax = (1.78 eV)(1.60 x 10-19 J/eV) KEmax hf - hft ; ft= = = 2.85 x 10-1⁹ J hf-KEmax h (6.63 x 10-34 Js) (1.00 x 10¹5 Hz)-(2.85 x 10-¹⁹ J) 6.63 x 10-34 Js f= 1.00 x 1015 Hz f₁= 5.70 X 1014 Hz Activity: Solve the following problems. Use the rubrics as your guide in presenting your solution (refer to attachment A.1 at the next page). 1. In the photoelectric effect, it is found that incident photons with energy 5.00 eV will produce electrons with a maximum kinetic energy 3.00 eV. What is the threshold frequency of this material?arrow_forward(a) The air immediately surrounding a certain lightning bolt in a thunderstorm is briefly heated to a temperature of 8.90 ✕ 103 K. Assuming the affected air behaves like a blackbody, what is the wavelength (in nm) of the photons emitted with the greatest intensity? ?max = answer in nm In which band of the electromagnetic spectrum does the air most strongly radiate? gamma ray / x-rayultraviolet visibleinfraredmicrowaveradio wave (b) The air immediately surrounding the detonation of a certain nuclear weapon is heated to a temperature of 9.90 ✕ 106 K.Assuming the heated air behaves like a blackbody, what is the wavelength (in pm) of the photons emitted with the greatest intensity? ?max = answer in pm In which band of the electromagnetic spectrum does the air most strongly radiate? gamma ray / x-rayultraviolet visibleinfraredmicrowaveradio wavearrow_forwardPhotoelectric work function of a photo- sensitive material is 3 × 10-19 J. Calculate its threshold wavelength.arrow_forward
- The work function for indium is 4.12 eV. (d) If light of energy 7.14 eV is incident on indium, what is the maximum kinetic energy of the ejected photoelectrons? Give the answer in electron volts. eV (e) For photons of energy 7.14 eV, what stopping potential would be required to arrest the current of photoelectron? Varrow_forwardBy what rate a photon emitted from a sodium vapor lamp? Assume that the lamp's light is monochromatic and of wavelength 589 nm? Answer : 1.5*10^20 s^-1arrow_forwardQUESTION 7 A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h-6.626 x 10-34 J-s-4.141 x 10-15, eV s, 1 eV 1.60 x 10-19 J CA 8.5 x 10¹4 Hz OB. OC 6.8 x 10¹4 Hz 7.6 × 10¹4 Hz 2.7 x 10¹4 Hzarrow_forward
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