Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Chapter 3, Problem 19P
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The value of the bias voltage.
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Monochromatic light from a laser shines onto a gold surface and produces photoelectrons with maximum kinetic energy KEmax = 3 eV. What is the wavelength of the laser light? Assume a work function of 5.10 eV for gold.Please give your answer in units of nm, rounded to 1 decimal place. I.e, the answer you should enter should have the form: XX.X nm.
The work function of aluminum is 4.26 ev. What is the maximum velocity of an electron emitted from aluminum after the
absorption of a photon of wavelength 117 nm. Give your answer in m/s.
Round your answer to 2 decimal places.
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Question 10
A photon Compton scatters from an electron. At what scattering angle for the photon will the electron acquire the largest kinetic
energy?
45 degrees
90 degrees
C o degress
D 180 degrees
Shown is the typical photoelectric behavior of a metal as the anode-cathode potential difference ΔV is varied.a. Why do the curves become horizontal for ΔV ≳ 1 V? Shouldn’t the current increase as the potential difference increases? Explain.b. Why doesn’t the current immediately drop to zero for ΔV < 0 V? Shouldn’t ΔV < 0 V prevent the electrons from reaching the anode? Explain.c. The current is zero for ΔV < -2.0 V . Where do the electrons go? Are no electrons emitted if ΔV 6 -2.0 V? Or if they are, why is there no current? Explain.
Chapter 3 Solutions
Modern Physics
Ch. 3.2 - Calculate the quantum number, n, for this pendulum...Ch. 3.2 - An object of mass m on a spring of stiffness k...Ch. 3 - Prob. 1QCh. 3 - Prob. 2QCh. 3 - Prob. 3QCh. 3 - Prob. 4QCh. 3 - Prob. 5QCh. 3 - Prob. 6QCh. 3 - Prob. 7QCh. 3 - Prob. 8Q
Ch. 3 - Prob. 9QCh. 3 - Prob. 10QCh. 3 - Prob. 11QCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 30PCh. 3 - Prob. 31PCh. 3 - Prob. 32PCh. 3 - Prob. 33PCh. 3 - Prob. 34PCh. 3 - Prob. 35PCh. 3 - Prob. 36PCh. 3 - Prob. 37PCh. 3 - As a single crystal is rotated in an x-ray...Ch. 3 - Prob. 39PCh. 3 - Prob. 40PCh. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43PCh. 3 - Prob. 44PCh. 3 - Prob. 46PCh. 3 - Prob. 47PCh. 3 - Prob. 48P
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- A laser with a power output of 2.00 mW at a 400-nm wavelength is used to project a beam of light onto a calcium photoelectrode. (a) How many photoelectrons leave the calcium surface per second? (b) What power is carried away by ejected photoelectrons, given that the work function of calcium is 2.31 eV? (c) Calculate the photocurrent. (d) If the photoelectrode suddenly becomes electrically insulated and the setup of two electrodes in the circuit suddenly starts to act like a 2.00-pF capacitor, how long will current flow before the capacitor voltage stops it?arrow_forwardThe work function of a certain metal is found to be 1.82 eV. What is the stopping potential required to to stop the current in a photoelectric effect experiment if the wavelength of the incident light is 413 nm. Round your answer to 3 significant figures. Add your answerarrow_forwardA sodium atom in one of the states labeled “Lowest excited levels” in Fig. remains in that state, on average, for 1.6 * 10-8 s before it makes a transition to the ground state, emitting a photon with wavelength 589.0 nm and energy 2.105 eV. What is the uncertainty in energy of that excited state? What is the wavelength spread of the corresponding spectral line?arrow_forward
- The following data gives stopping potential Vo versus wavelength for photoelectrons produced from a metal surface. (Be sure to include the correct units and use three significant figures.) Table 1 Vo (nm) (volts) 50 22.3 100 9.29 150 5,20 200 3.09 250 1.84 300 1.04 Use an analysis similar to that used in the inlab procedure to determine the work function (in ev) for this surface. (Use 1 ev = 1,602 x 10-19 J, e- 1.602 x 10-19 C, c = 2.998 x 10 m/s, and h= 6.626 x 10-34 )-s = 4.136 x 10"15 ev -s as necessary.) X evarrow_forwardQ°: The line width of a helium-neon laser is 10° Hz. The operating wavelength is 632.8 mm and the power is 1mW. a. How many photons are emitted per second? b. If the output beam is Imm in diameter, at what temperature would a blackbody have to be in order to emit the same number of photon from an equal area and over the same frequency interval as the laser?arrow_forwardIn a photoelectric experiment it is found that a stopping potential of 1.00 V is needed to stop all the electrons when incident light of wavelength 225 nm is used and 1.5 V is needed for light of wavelength 207 nm. From these data determine Planck's constant. (Enter your answer, in eV s, to at least four significant figures.) 4.2367e-15 X ev s From these data determine the work function (in eV) of the metal. 4.6 X evarrow_forward
- 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:arrow_forwardA 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)?arrow_forwardAn APD has a quantum efficiency of 50% at a wavelength of 500 nm in the absence of multiplication. If the device is operated with a reverse bias to give a multiplication factor of 8. Calculate: a. responsivity. b. the photocurrent of the APD if the incident optical power is 4 μW.arrow_forward
- In a photoelectric effect experiment, it is found that no current flows unless the incident light has a wavelength shorter than 359 nm nm. What stopping potential will be needed to halt the current if light of 225 nm falls on the surface? Express your answer with the appropriate units. μA 2.249 V Vo =arrow_forwardThe photoelectric threshold wavelength of a tungsten surface is 272 nm.at. What is the threshold frequency in (Hz)?b. What is the extraction work (in eV) for this tungsten?vs. What is the maximum kinetic energy (in eV) of the electrons ejected from this tungsten surface by ultraviolet radiation of frequency 1.45 × 1015 Hz?arrow_forwardMonochromatic light from a laser shines onto a gold surface and produces photoelectrons with maximum kinetic energy KEmax = 3.5 eV. What is the wavelength of the laser light? Assume a work function of 5.10 eV for gold. Please give your answer in units of nm, rounded to 1 decimal place.arrow_forward
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