a photoelectric experiment using a sodium surface, you find a stopping potential of 1.86 V for a wavelength of 300 nm and a opping potential of 0.885 V for a wavelength of 393 nm. From these data find (a) a value for the Planck constant, (b) the work unction for sodium, and (c) the cutoff wavelength o for sodium. (a) Number i 6.59E-34 b) Number 2.26 c) Number i 547 Units J Units eV Units nm

a photoelectric experiment using a sodium surface, you find a stopping potential of 1.86 V for a wavelength of 300 nm and a opping potential of 0.885 V for a wavelength of 393 nm. From these data find (a) a value for the Planck constant, (b) the work unction for sodium, and (c) the cutoff wavelength o for sodium. (a) Number i 6.59E-34 b) Number 2.26 c) Number i 547 Units J Units eV Units nm

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter3: The Quantum Theroy Of Light

Section: Chapter Questions

Problem 18P

See similar textbooks

Similar questions

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?
Show that Wien’s displacement law results from Planck’s radiation law. (Him: substitute x=hckT and write Planck’s law in the form I(x,T)=Ax5(ex1) , where A=2( kT)5(h4c3). Now, for fixed T, find the position of the maximum in I(x,T) by solving for x in the equation dI(x,T)dx=0.
Suppose that in the photoelectric-effect experiment we make a plot of the detected current versus the applied potential difference. What information do we obtain from such a plot? Can we determine from it the value of Planck’s constant? Can we determine the work function of the metal?
If 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?
Check Your Understanding Cut-off frequency for the photoelectric effect in some materials is 8.01013 Hz. When the incident light has a frequency of 121014 Hz. the stopping potential is measured as -0.16 V. Estimate a value of Planck’s constant from these data (in units J • s and eV • s ) and determine the percentage error of your estimation.
What is the de Brogue wavelength of a proton whose kinetic energy is 2.0 MeV? 10.0 MeV?
At what velocity will an electron have a wavelength of 1.00 m?
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?
What is the wavelength of an electron accelerated from rest in a 30.0-kV potential difference?
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?
A photoelectric experiment with cesium yields stopping potentials of 0.95 V and0.38 V for λ = 435.8 nm and λ = 546.1 nm, respectively. Using only these numberstogether with the values of the speed of light (3 ×108 m/s) and the electron charge (e = -1.6 ×10−19 C), find(a) the work function in eV for cesium,(b) the value for Planck’s constant h, and(c) the cutoff frequency, below which no electrons would be emitted.
In a photoelectric experiment using a sodium surface, youfind a stopping potential of 1.85 V for a wavelength of 300 nm anda stopping potential of 0.820 V for a wavelength of 400 nm. Fromthese data find (a) a value for the Planck constant, (b) the workfunction fi for sodium, and (c) the cutoff wavelength l0 for sodium.