Fundamentals Of Physics
11th Edition
ISBN: 9781119573968
Author: David Halliday
Publisher: WILEY
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Chapter 38, Problem 18P
To determine
To find
Suitable elements for photocell from the given list
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You wish to pick an element for a photocell that will operate via the photoelectric effect with visible light.Which of the following are suitable (work functions are in parentheses): tantalum (4.2 eV), tungsten (4.5 eV), aluminum (4.2 eV), barium (2.5 eV), lithium (2.3 eV)?
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:
. Lithium, beryllium, and mercury have work functions of 2.30 eV, 3.90 eV, and 4.50 eV, respectively. Light with a wavelength of 400 nm is incident on each of these metals. (a) Which of these metals emit photoelectrons in response to the light? Why? (b) Find the maximum kinetic energy (en eVs)for the photoelectrons in each case where photoelectrons are emitted.
Chapter 38 Solutions
Fundamentals Of Physics
Ch. 38 - Prob. 1QCh. 38 - Prob. 2QCh. 38 - Prob. 3QCh. 38 - Prob. 4QCh. 38 - Prob. 5QCh. 38 - Prob. 6QCh. 38 - Prob. 7QCh. 38 - Prob. 8QCh. 38 - Prob. 9QCh. 38 - Prob. 10Q
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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?arrow_forwardA 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?arrow_forwardA 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?arrow_forward
- 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_forwardIf the work function of a metal is 3.2 eV, what is the maximum wavelength that a photon can have to eject a photoelectron from this metal surface?arrow_forward(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?arrow_forward
- A strange metallic rock is found and is being tested. Suppose that light with a frequency of 9.40 ✕ 1014 Hz is incident upon the rock and a stopping potential of 1.50 V is needed to reduce the electron current to zero in a photoelectric experiment.What is the minimum frequency of light for which electrons are still ejected from the surface of this material? Hzarrow_forwardYou are out to prove the photoelectric effect for yourself. You use a metal with a known binding energy of 2.09 eV, but you have no idea what the wavelength of your incident light is. You measure a stopping voltage for the electrons of 2.6 V. a) What is the maximum kinetic energy, in J, of the electrons ejected from the metal? J b) What is the wavelength of the incident light? c) What is the longest wavelength that would cause an electron to be ejected from the same metal with a binding energy of 2.09 eV?arrow_forwardTwo light sources are used in a photoelectric experiment to determine the work function of a particular metal surface. When green light from a mercury lamp (546.1 nm) is used, a stopping potential of 0.376 V reduces the photocurrent to zero. Based on this measurement, what is the work function of this metal?arrow_forward
- The work function of a material refers to the minimum energy required to remove an electron from the material. The work function of tungsten is 4.55 eV. Calculate the maximum wavelength (in nm) for the photoelectric emission of electrons. O λ = 220 nm O λ = 287 nm Oλ = 292 nm Oλ = 273 nmarrow_forwardb) 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.arrow_forwardA strange metallic rock is found and is being tested. Suppose that light with a frequency of 9.60 ✕ 1014 Hz is incident upon the rock and a stopping potential of 1.10 V is needed to reduce the electron current to zero in a photoelectric experiment. (a) What is the maximum kinetic energy of an electron ejected by this light from this material? eV(b) What is the work function of this material? eVarrow_forward
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