University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
14th Edition
ISBN: 9780321982582
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Question
Chapter 38, Problem 38.17DQ
To determine
Whether a pulsed laser light can be as monochromatic as light from a laser that emits steady, continuous beam.
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1. a) What are the energy and momentum of a photon of red light of
wavelength 650 nm? (b) What is the wavelength of a photon of energy 2.40
eV?
It takes 492 kJ of energy to remove one mole of electrons from the atoms on the surface of solid gold. What is the speed of the ejected electrons (in m/s), if the incoming light has a wavelength of 200.0 nm
The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E <
hf – W, where h is Planck's constant, f is the frequency of the light, and W is the work-function.
Sodium has W = 3.2 x 10-19 J. When sodium is illuminated by monochromatic light of a particular
frequency, electrons are emitted with speeds up to 8 x 105 m s-1.
a)
Calculate the wavelength of the light.
b)
Calculate the stopping potential.
Chapter 38 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (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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- The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E < hf – W, where h is Planck's constant, f is the frequency of the light, and W is the work-function. Sodium has W = 3.2×10-19 J. When sodium is illuminated by monochromatic light of a particular frequency, electrons are emitted with speeds up to 8 x 105 ms-1. a) Calculate the wavelength of the light. b) Calculate the stopping potential.arrow_forwardA carbon atom's diameter is approximately 0.2 nm. What fraction of this size is an x-ray of frequency 6.7 x1018 Hz? X 0.2mm How many of these wavelengths would it take to span the diameter of a sodium atom (.23 nm)? N = wavesarrow_forwardThe photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E < hf – W, whereh is Planck's constant, f is the frequency of the light, and W is the work-function. Sodium has W = 3.2×10-19 J. When sodium is illuminated by monochromatic light of a particular frequency, electrons are emitted with speeds up to 8 x 105 ms-1. a) Calculate the wavelength of the light. b) Calculate the stopping potential.arrow_forward
- Under the correct conditions, the element molybdenum emits X-rays with a characteristic wavelength of 0.711 A (7.11×10-11 m). These X-rays are used in diffraction experiments to determine molecular structures. How fast does an electron need to be moving to have the same wavelength as these X-rays?arrow_forwardSolar radiation falls on Earth's surface at a rate of 1900 W/m². Assuming that the radiation has an average wavelength of 580 nm, how many photons per square meter per second fall on the surfaces? The speed of light is 3 × 10° m/s and Planck's constant is 6.62607 × 10-34 J. s. Answer in units of photon/m² · s. 2arrow_forwardPulsed lasers have many applications, but are very complicated to construct. One problem is chromatic aberration, another is aligning the components. Commonly available laser systems can produce 1 fs (10-¹4 s) pulses. a) how far does light travel in 1 fs? b) If the energy per pulse is 100 mJ, what's the power per pulse (in Watts)? c) calculate the (minimum) spread of frequencies required to produce a 1 fs pulse. d) if the center wavelength is 1 um, what is the range of wavelengths contained in a single pulse? e) common varieties of optical glass have a dispersion An/A2 = 0.025/micron. 1) if the index of refraction is 1.51 for λ = 1 um, what is the value of 'n' for the upper and lower wavelength? 2) the focal length of a lens is inversely proportional to the index of refraction: 1/f~ (n-1). What is the ratio of the focal lengths for the two extreme wavelengths? 3) how much longitudinal chromatic aberration (the difference in focal length between two colors) is there for a 100 mm focal…arrow_forward
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