Essential University Physics
4th Edition
ISBN: 9780134988566
Author: Wolfson, Richard
Publisher: Pearson Education,
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Question
Chapter 34, Problem 81P
(a)
To determine
The experimental value of Plank’s constant.
(b)
To determine
The work function of the material.
(c)
To determine
Identify the material.
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Students have asked these similar questions
In a photoelectric experiment using a Potasium surface, you find a stopping potential of 0.57 V for a wavelength of
434 nm and a stopping potential of 2.30 V for a wavelength of 271 nm.
Because this is an experiment, your value of Planck's constant will be slightly different from the official value.
From these data find
a) a value for Planck's constant h
8.81
x10-34 J . s
b) the work function for Potasium
2.29
eV
c) the cutoff wavelength for this metal
541.5
пт
The 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?
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.
Chapter 34 Solutions
Essential University Physics
Ch. 34.2 - Prob. 34.1GICh. 34.3 - If you replot Fig. 34.7 for a material with a...Ch. 34.3 - Prob. 34.3GICh. 34.4 - Prob. 34.4GICh. 34.5 - Prob. 34.5GICh. 34.6 - Prob. 34.6GICh. 34 - Prob. 1FTDCh. 34 - Prob. 2FTDCh. 34 - Prob. 3FTDCh. 34 - Prob. 4FTD
Ch. 34 - Prob. 5FTDCh. 34 - Prob. 6FTDCh. 34 - Prob. 7FTDCh. 34 - Prob. 8FTDCh. 34 - Prob. 9FTDCh. 34 - Prob. 10FTDCh. 34 - Prob. 11ECh. 34 - The surface temperature of the star Rigel is 104K....Ch. 34 - Prob. 13ECh. 34 - Prob. 14ECh. 34 - Prob. 15ECh. 34 - Prob. 16ECh. 34 - Prob. 17ECh. 34 - Prob. 18ECh. 34 - Prob. 19ECh. 34 - Prob. 20ECh. 34 - Prob. 21ECh. 34 - Prob. 22ECh. 34 - Prob. 23ECh. 34 - Prob. 24ECh. 34 - Prob. 25ECh. 34 - Prob. 26ECh. 34 - Prob. 27ECh. 34 - Prob. 28ECh. 34 - Prob. 29ECh. 34 - Prob. 30ECh. 34 - Prob. 31ECh. 34 - Prob. 32ECh. 34 - Prob. 33ECh. 34 - Prob. 34ECh. 34 - Prob. 35ECh. 34 - Prob. 36ECh. 34 - Prob. 37ECh. 34 - Prob. 38ECh. 34 - Prob. 39ECh. 34 - Prob. 40ECh. 34 - Prob. 41ECh. 34 - Prob. 42PCh. 34 - Prob. 43PCh. 34 - Prob. 44PCh. 34 - Prob. 45PCh. 34 - Prob. 46PCh. 34 - Prob. 47PCh. 34 - Prob. 48PCh. 34 - Prob. 49PCh. 34 - Prob. 50PCh. 34 - Prob. 51PCh. 34 - Prob. 52PCh. 34 - Prob. 53PCh. 34 - Prob. 54PCh. 34 - Prob. 55PCh. 34 - Prob. 56PCh. 34 - Prob. 57PCh. 34 - Prob. 58PCh. 34 - Prob. 59PCh. 34 - Prob. 60PCh. 34 - Prob. 61PCh. 34 - Prob. 62PCh. 34 - Prob. 63PCh. 34 - Prob. 64PCh. 34 - Prob. 65PCh. 34 - Prob. 66PCh. 34 - Prob. 67PCh. 34 - Prob. 68PCh. 34 - Prob. 69PCh. 34 - Prob. 70PCh. 34 - Prob. 71PCh. 34 - Prob. 72PCh. 34 - Prob. 73PCh. 34 - Prob. 74PCh. 34 - Prob. 75PCh. 34 - Prob. 76PCh. 34 - Prob. 77PCh. 34 - Prob. 78PCh. 34 - Prob. 79PCh. 34 - Prob. 80PCh. 34 - Prob. 81PCh. 34 - Prob. 82PPCh. 34 - Prob. 83PPCh. 34 - Prob. 84PPCh. 34 - Prob. 85PP
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- Explain how you can determine the work function from a plot of the stopping potential versus the frequency of the incident radiation in a photoelectric effect experiment. Can you determine the value of Planck’s constant from this plot?arrow_forwardThe 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 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_forward
- Experiments are performed with ultra-cold neutrons having velocities as small as 1.00 m/s. (a) What is the wavelength of such a neutron? (b) What is its kinetic energy in eV?arrow_forwardThe 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_forwardPotassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find: The threshold frequency. The threshold wavelength. The maximum electron ejection speed if the light has a wavelength of 170 nm . The stopping potential if the wavelength is 170 nm . Throughout this problem, be sure to use 6.63×10−34J⋅s for Planck's constant. a) The maximum photoelectron ejection speed in meters per second for an electron ejected from potassium if the light has a wavelength of 170 nm. Express your answer in meters per second. b)The maximum photoelectron ejection speed in meters per second for an electron ejected from gold if the light has a wavelength of 170 nm . c)The stopping potential in volts for potassium if the wavelength is 170 nm. Express your answer in volts. d) The stopping potential in volts for gold if the wavelength is 170 nm. Express your answer in volts.arrow_forward
- ▼ 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 ?arrow_forwardPLEASE PROVIDE FULL ANSWERS!a. The maximum energy of photoelectrons from Al is 2.3 eV for radiation of 200 nm and 0.9 eV for radiation of 216 nm. Use these data to calculate the Planck’s constant and the work function of Al. b. The threshold wavelength for the photoelectric effect in tungsten is 270 nm. Calculate the work function of tungsten, and calculate the maximum kinetic energy that a photoelectron can have when radiation of 120 nm falls on tungstenarrow_forwardExplain the reasoning by which we claim that the stopping potential Vstop measures the maximum kinetic energy of the electrons in a photoelectric-effect experiment.arrow_forward
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