85 In about 1916, R. A. Millikan found the following stopping-potential data for lithium in his photoelectric experiments:Wavelength (nm) 433.9 404.7Stoppingpotential (V)365.0 312.5253.50.550.731.091.672.57Use these data to make a plot like Fig. 38-2 (which is for sodium)and then use the plot to find (a) the Planck constant and (b) thework function for lithium.

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Answered: 85 In about 1916, R. A. Millikan found…

University Physics Volume 3

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Chapter6: Photons And Matter Waves

Section: Chapter Questions

Problem 66P: The work function for potassium is 2.26 eV. What is the cutoff frequency when this metal is used as...

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The work function for potassium is 2.26 eV. What is the cutoff frequency when this metal is used as photoelectrode? What is the stopping potential when for the emitted electrons when this photo electrode is exposed to radiation of frequency 1200 THz?
A 600-nm light falls on a photoelectric surface and electrons with the maximum kinetic energy of 0.17 eV are emitted. Determine (a) the work function and (b) the cutoff frequency of the surface. (c) What is the stopping potential when the surface is illuminated with light of wavelength 400 nm?
(a) Calculate the number of photoelectrons per second ejected from a 1.00-mm2 area of sodium metal by 500-nm M radiation having an intensity of 1.30 kW/m2 (the intensity of sunlight above the Earth's atmosphere). (b) Given that the binding energy is 2.28 eV, what power is carried away by the electrons? (c) The electrons carry away less power than brought in by the photons. Where does the other power go? How can it be recovered?
A 400-nm laser beam is projected onto a calcium electrode. The power of the laser beam is 2.00 mW and the work function of calcium is 2.31 eV. (a) How many photoelectrons per second are ejected? (b) What net power is carried away by photoelectrons?
b) Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. When green light from a mercury lamp (2 = 546.1 nm) is used, a stopping potential of 0.376 V reduces the photocurrent to zero. Based on this measurement, %3D i. Calculate the work function for this metal. ii. If the yellow light from a helium discharge tube (2 = 587.5 nm) is used, find the %3D new stopping potential.
▼ In a photoelectric-effect experiment, the stopping potential is 1.37 V if the light used to illuminate the cathode has wavelength 475 nm. Find the work function (in eV) of the cathode material. Express your answer in electron volts. φ= Submit Part F 15. ΑΣΦ Vo = Request Answer μA Find the stopping potential if the wavelength is decreased to 425 nm. Express your answer with the appropriate units. Value Submit Request Answer P Units ? 599 eV ?
A gold cathode (work function = 5.1 eV) is illuminated with light of wavelength 250 nm. It is found that the photoelectron current is zero when AV = 0 V. Would the current change if: a. The intensity is doubled? b. The anode-cathode potential difference is increased to AV= 5.5 V? c. The cathode is changed to aluminum (work function = 4.3 eV)?
In 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]
Light of wavelength 350 nm falls on a potas- sium surface, and the photoelectrons have a maximum kinetic energy of 1.3 eV. What is the work function of potassium? The speed of light is 3 × 10° m/s and Planck's J.s. -34 constant is 6.63 × 10° Answer in units of eV. What is the threshold frequency for potas- sium? Answer in units of Hz.
A metal surface is illuminated with light of different wavelengths and the corresponding stopping potentials of the photoelectrons are shown in the Table below. λ (Å) 1869 2372 2875 V(V) 1.37 1.27 1.17 Using the Table, determine the photoelectric threshold wavelength (in Å).
Photoelectric work function of a metal is 3 eV. Find the maximum K.E. and maximum speed of photoelectrons emitted when radiation of wavelength 4800 A.U. is incident on the metal surface. (Given ; mass of electron = 9,1 x 10-31 kg). !3D
A light source is used in a photoelectric experiment. The metal copper is illuminated, if a stopping potential of 1.03 V is required, what is the energy of the light shining on the metal in eV? Answer to FIVE decimal places. Do NOT enter units. Use and carry ALL your digits of your calculator. Metal #Metal o (eV) 1 Ag 4.73 Al 4.08 Cu 4.70 4 Fe 4.50 Na 2.46 6. Pb 4.14 Pt 6.35 Zn 4.31 our Answer:

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