COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 39QAP
To determine
The frequency and wavelength of a photon of energy
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I Review | Constants Periodic Table
he human eye can barely detect a star whose intensity at the earth's
urface is 1.6 x 10-11 W/m?
Part A
If the dark adapted eye has a pupil diameter of 6.0 mm , how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm
?
X•10"
N =
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1-Which of the following are consistent with the wave-like behavior of light?
.Line Spectra
• Blackbody Radiation
• Refraction
• Diffraction
• The Photoelectric Effect
2-What is the value of c?
0 3.00 × 108 J-s
0 6.636 × 10-34 J-s
0 3.00 × 108 m/s
0 6.02 × 1023 m/s
3-Which of the following are consistent with the wave-like behavior of light?
• Blackbody Radiation
• Line Spectra
• Diffraction
• Refraction
• The Photoelectric Effect
4-What is the correct value for Planck's constant?
0 3.00 × 108 J-s
• 6.02 × 1023 m/s
0 3.00 x 108 m/s
0 6.626 × 10-34 J-s
5-Which regions of the electromagnetic spectrum are higher in frequency than microwaves? [Select all that apply.]
• Visible
.Infrared
•X-Rays
• Ultraviolet
Gamma Rays
•Radio
•61 SSM The function (x) displayed in Eq. 38-27 can describe a
free particle, for which the potential energy is U(x) = 0 in
Schrödinger's equation (Eq. 38-19). Assume now that U(x) = U, =
a constant in that equation. Show that Eq. 38-27 is a solution of
Schrödinger's equation, with
%3D
-V2m(E – U)
giving the angular wave number k of the particle.
k
k =
Chapter 26 Solutions
COLLEGE PHYSICS
Ch. 26 - Prob. 1QAPCh. 26 - Prob. 2QAPCh. 26 - Prob. 3QAPCh. 26 - Prob. 4QAPCh. 26 - Prob. 5QAPCh. 26 - Prob. 6QAPCh. 26 - Prob. 7QAPCh. 26 - Prob. 8QAPCh. 26 - Prob. 9QAPCh. 26 - Prob. 10QAP
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- (a) If the power output of a 650-kHz radio station is 50.0 kW, how many photons per second are produced? (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 100 km. Assume no reflection from the ground or absorption by the air.arrow_forwardConfirm the statement in the text that the range of photon energies for visible light is 1.63 to 3.26 eV, given that the range of visible wavelengths is 380 to 760 nm.arrow_forwardAn x ray tube has an applied voltage of 100 kV. (a) What is the most energetic x-ray photon it can produce? Express your answer in electron volts and joules. (b) Find the wavelength of such an X—ray.arrow_forward
- Which type of radiation is most suitable for the observation of diffraction patterns on crystalline solids; radio waves, visible light, or X-rays? Explain.arrow_forwardThree light sources are shone onto a plant: i) ii) iii) How much light (i.e. total number of photons) is available for the plant to use for photosynthesis over an 8 hr photoperiod, considering the plant has a total leaf area of 0.175 m? 320 nm at an intensity of 200 umol photons.ms 440 nm at an intensity of 300 umol photons.ms 675 nm at an intensity of 300 umol photons.ms'arrow_forward57. The retina of a human eye can detect light when radiant energy incident on it is at least 4.00×10−17 J. For light of 595−nm wavelength, how many photons does this energy correspond to?arrow_forward
- A light source of wavelength λ illuminates a metal and ejects photoelectrons with a maximum kinetic energyof 1.00 eV. A second light source with half the wavelength of the first ejects photoelectrons with a maximumkinetic energy of 4.00 eV.• Determine the work function of the metalarrow_forwardMY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced? photons/s (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 125 km. Assume no reflection from the ground or absorption by the air. photons/(s · m²) Additional Materialsarrow_forwardFind the energy of the following. Express your answers in units of electron volts, noting thet 1 eV = 1.60 x 10 19 J. (a) a photon having a frequency of 7.40 x 10 Hz 3066.375 • V ev (b) a photon having a wavelength of 8.60 x 10 nm 3.56E-12 Calculate the frequency of light carresponding to the given wavelength and from the frequency calculate the energy of a photon with that wavelength. eV Need Help? Read It Master Itarrow_forward
- -11 The threshold of dark-adapted (scotopic) vision is 4.5 x 10 W/m² at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 9.0 mm, how many photons per second enter the eye? photons/sarrow_forwardh = 6.63 x 10-34 J • s; c = 3.00 × 108 m/s; me = 9.11 × 10-³1 kg My potassium surface is illuminated by a monochromate leser light with a wavelength of 400 nm Determine the maximum speed of a photoelectron emitted from this surface if the -31 potassium surface has a work function of 2.30 ev. m 8.11 x 40 kg 2. A photon has a frequency of 7.50 x 10¹4 Hz, a. Determine the energy and the momentum of this photon. b. If all the energy of this photon were to be converted to mass, determine the equivalent mass for the particle. c. A microscopic specimen has a wavelength of 8.2 × 10-¹4m and a speed of 1.1 x 105 m/s. Determine the mass of this microscopic specimen.arrow_forwardWhen light with a wavelength of 198 nm strikes the surface of tin metal. What is the photon energy from the wavelength? А) 1.2х 10:18J в) 1.0х 10:18] 1.98 х 107] D 7.1 x 10-19 Jarrow_forward
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