Chapter 38: Q. 22 (page 1114)
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In a photoelectric-effect experiment, the stopping potential was measured for several different wavelengths of incident light. The data are as follows:
Use an appropriate graph of the data to determine
(a) the metal used for the cathode and
(b) an experimental value for Planck’s constant .
What is the third-longest wavelength in the absorption spectrum of hydrogen?
The diameter of the nucleus is about . A simple model of the nucleus is that protons and neutrons are confined within a one-dimensional box of length . What are the first three energy levels, in , for a proton in such a box?
Imagine that the horizontal box of Figure 38.14 is instead oriented vertically. Also imagine the box to be on a neutron star where the gravitational field is so strong that the particle in the box slows significantly, nearly stopping, before it hits the top of the box. Make a qualitative sketch of the n = 3 de Broglie standing wave of a particle in this box.
The charge on a muon-a subatomic particle is -e and its mass 207 times that of an electron-
which is confined in a 15-pm-long, one-dimensional box.
(1 pm = 1 picometer = 10-12 m.)
What is the wavelength, in nm, of the photon emitted in a quantum jump from n=2 to n=1
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