University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 38, Problem 38.16DQ
To determine
The things wrong with considering the photon to be riding up and down on the crests and troughs of the
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In attempting to reconcile the wave and particle models of light, some people have suggested that the photon rides up and down on the crests and troughs of the electromagnetic wave. What things are wrong with this description?
If you shine light on a conducting metallic surface, the light can impart energy to electrons in the conductor, potentially freeing them from the surface if the energy is higher than the so-called "work function", which is the energy required to free the electron from the surface. If you place another conducting surface in a position at which it can catch these electrons, and connect these two conductors by another conductor such as a wire, you can generate a so-called photoelectric current. Suppose the work function of a particular metal is 4.8 x 10-19 J. If light can impart an energy of 14.4 x 10-19 J to each electron, what must be the potential difference of the two conducting surfaces in order to stop a photoelectric current? Which conducting surface should be at the higher potential?
Suppose you need to image the structure of a virus with a diameter of 50 nm. For a sharp image, the wavelength of the probing wave must be 5.0 nm or less. We have seen that, for imaging such small objects, this short wavelength is obtained by using an electron beam in an electron microscope. Why don’t we simply use short-wavelength electromagnetic waves? There’s a problem with this approach: As the wavelength gets shorter, the energy of a photon of light gets greater and could damage or destroy the object being studied. Let’s compare the energy of a photon and an electron that can provide the same resolution.
For the electron with a de broglie wavelength of 3.5 nm, what is the kinetic energy (in eV)?
Chapter 38 Solutions
University Physics with Modern Physics (14th Edition)
Ch. 38.1 - Silicon films become better electrical conductors...Ch. 38.2 - Prob. 38.2TYUCh. 38.3 - Prob. 38.3TYUCh. 38.4 - Prob. 38.4TYUCh. 38 - Prob. 38.1DQCh. 38 - Prob. 38.2DQCh. 38 - Prob. 38.3DQCh. 38 - Prob. 38.4DQCh. 38 - Prob. 38.5DQCh. 38 - Prob. 38.6DQ
Ch. 38 - Prob. 38.7DQCh. 38 - Prob. 38.8DQCh. 38 - Prob. 38.9DQCh. 38 - Prob. 38.10DQCh. 38 - Prob. 38.11DQCh. 38 - Prob. 38.12DQCh. 38 - Prob. 38.13DQCh. 38 - Prob. 38.14DQCh. 38 - Prob. 38.15DQCh. 38 - Prob. 38.16DQCh. 38 - Prob. 38.17DQCh. 38 - Prob. 38.1ECh. 38 - Prob. 38.2ECh. 38 - Prob. 38.3ECh. 38 - Prob. 38.4ECh. 38 - Prob. 38.5ECh. 38 - Prob. 38.6ECh. 38 - Prob. 38.7ECh. 38 - Prob. 38.8ECh. 38 - Prob. 38.9ECh. 38 - Prob. 38.10ECh. 38 - Prob. 38.11ECh. 38 - Prob. 38.12ECh. 38 - Prob. 38.13ECh. 38 - Prob. 38.14ECh. 38 - Prob. 38.15ECh. 38 - Prob. 38.16ECh. 38 - Prob. 38.17ECh. 38 - Prob. 38.18ECh. 38 - Prob. 38.19ECh. 38 - Prob. 38.20ECh. 38 - Prob. 38.21ECh. 38 - An electron and a positron are moving toward each...Ch. 38 - Prob. 38.23ECh. 38 - Prob. 38.24ECh. 38 - Prob. 38.25ECh. 38 - Prob. 38.26PCh. 38 - Prob. 38.27PCh. 38 - Prob. 38.28PCh. 38 - Prob. 38.29PCh. 38 - Prob. 38.30PCh. 38 - Prob. 38.31PCh. 38 - Prob. 38.32PCh. 38 - Prob. 38.33PCh. 38 - Prob. 38.34PCh. 38 - Prob. 38.35PCh. 38 - Prob. 38.36PCh. 38 - Prob. 38.37PCh. 38 - Prob. 38.38PCh. 38 - Prob. 38.39PCh. 38 - Prob. 38.40CPCh. 38 - Prob. 38.41PPCh. 38 - Prob. 38.42PPCh. 38 - Prob. 38.43PPCh. 38 - Prob. 38.44PPCh. 38 - Prob. 38.45PP
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- What is the energy (in eV) of the following photons? A 200-nm photon of ultraviolet light?arrow_forwardA pulsed ruby laser emits light at 694.3 nm. For a 14.7-ps pulse containing 3.40 J of energy, find the following. (a) the physical length of the pulse as it travels through space _________________mm(b) the number of photons in it__________________ photons(c) If the beam has a circular cross section 0.600 cm in diameter, find the number of photons per cubic millimeter. _______________photons/mm3arrow_forwardDoes each of the following support the wave nature or the particle nature of light? (a) The existence of the cutoff frequency in the photoelectric effect; (b) Young's double-slit experiment; (c) the shift in the photon frequency in Compton scattering; (d) the diffraction of lightarrow_forward
- Which of the following statements best describe the dual nature of light? A. In some instances, light behaves as a wave and photons are emitted B. In some instances, light behaves as a particle, and energy is emitted C. In some instances, light behaves as a wave, in other instances light behaves as a particle D. In some instances, light behaves as a wave, in other instances it has interferences E. In some instances, light behaves as a wave which consists of constructive interferences and destructive interferencesarrow_forwardDoes each of the following support the wave nature or the particle nature of light?(Choose more than one)(a) The existence of the cutoff frequency in the photoelectric effect;(b) Young's double-slit experiment;(c) the shift in the photon frequency in Compton scattering; (d) the diffraction of lightarrow_forwardA free electron at rest causes an xray photon with a wavelength of 0.240 nm to scatter. With respect to the direction of the input photon, the scattered photon rotates at an angle of 125 degrees. Find the a) initial momentum and b) final momentum.arrow_forward
- Why go through the expense of building an electron microscope for studying very small objects such as organic molecules? Why not just use extremely short electromagnetic waves, which are much cheaper to generate?arrow_forwardNuclear-pumped x-ray lasers are seen as a possible weapon to destroy ICBM booster rockets at ranges up to 2000 km. One limitation on such a device is the spreading of the beam due to diffraction, with resulting dilution of beam intensity. Consider such a laser operating at a wavelength of 1.40 nm. The element that emits light is the end of a wire with diameter 0.200 mm. (a) Calculate the diameter of the central beam at a target 2000 km away from the beam source. (b) What is the ratio of the beam intensity at the target to that at the end of the wire? (The laser is fired from space, so neglect any atmospheric absorption.)arrow_forwardWhat is the momentum of a 589-nm yellow photon?arrow_forward
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