COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 23QAP
To determine
In Compton's experiment, change in photons wavelength depends on what.
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1. X-ray photons of wavelength 0.02480 nm are incident on a target and the Compton-
scattered photons are observed at 90.0 •. (a) What is the wavelength (in nm) of the
scattered photons? (b) What is the momentum of the incident photons? Of the
scattered photons? (c) What is the kinetic energy of the scattered electrons? (d) What
is the momentum (magnitude and direction) of the scattered electrons?
3. Using the average speed of a gas, (8RT?MW)1/2, determine the average de Broglie wavelength for an He atom at 25 °C and at 500 °C.How fast would the He atom need to travel in order to have the same linear momentum as a 500 nm photon?
Chapter 26 Solutions
COLLEGE PHYSICS
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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_forward(a) How far away must you be from a 650-kHz radio station with power 50.0 kW for there to be only one photon per second per square meter? Assume no reflections or absorption, as if you were in deep outer space. (b) Discuss the implications for detecting intelligent life in other solar systems by detecting their radio broadcasts.arrow_forwardWhat is the kinetic energy of an electron in a TEM having a 0.0100-nm wavelength?arrow_forward
- Which aspects of the photoelectric effect cannot be explained without photons? Which can be explained without photons? Are the latter inconsistent with the existence of photons?arrow_forwardUnreasonable Results A student in a physics laboratory observes a hydrogen spectrum with a diffraction grating for the purpose of measuring the wavelengths of the emitted radiation. In the spectrum, she observes a yellow line and finds its wavelength to be 589 nm. (a) Assuming this is part of the Balmer series, determine ni, the principal quantum number of the initial state. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?arrow_forward2. Light of frequency 7.60 x 10¹4 Hz ejects electrons from surface (A) with a maximum kinetic energy that is 1.40 x 10-19 J greater than the maximum kinetic energy of electrons ejected from surface B. Calculate the difference in work function for these two surfaces.arrow_forward
- Problems • A beam of light with intensity of 3mW and a wavelength of 742 nm is striking a solar cell. Estimate the number of photons incident on the cell. • If the dark saturation current of a solar cell is 1.7X10-8 A/m², the cell temperature is 27 °C, and the short-circuit current density is 250 A/m?, Vmax = 0.526 V. Calculate the open-circuit voltage, Voci current power, maximumlmax; power,maximunfatdensity radiationsolar availablethe Whennmax.efficiency,maximum W/m? and 820 isarrow_forwardProblems • A beam of light with intensity of 3mW and a wavelength of 742 nm is striking a solar cell. Estimate the number of photons incident on the cell. • If the dark saturation current of a solar cell is 1.7X10-8 A/m2, the cell temperature is 27 °C, and the short-circuit current density is 250 A/m2, Vmax = 0.526 V. Calculate the open-circuit voltage, Voci current density at maximum power, Imax; maximum power, Pmaxi and maximum efficiency, nmax: When the available solar radiation is 820 W/m2arrow_forwardDetermine the largest change in wavelength that can occur in Compton scattering fromstationary electrons.arrow_forward
- 1A) When a completely ionized helium atom moves across a potential difference, its energy changes by AU=(-1.18x10^-15) J. What is the value of the potential difference? Provide your answer in volts, use scientific notation. Use three significant figures in your response. Ignore D2L's comment about "highest possible power", present your answer in format X.YZ*10^N. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: |x10 Answer units B) Two point charges, q1 =4.0 nC and q2 =-5.0 nC are located at A =(0.5,-1.0)m and B =(-2.6,-3.6)m, respectively. Calculate the electric potential due to these point charges at P =(-5.2,-2.7)m. Express your answer in volts, use appropriate symbols. Express your answer rounded to have at least one digit after the decimal, do not use scientific notation. Using more significant figures will not be considered incorrect, using fewer may result in errors due to rounding. Your Answer: Answer unitsarrow_forwardIn a photoelectric-effect experiment, the intensity of the light is increased while the frequency, which is above the threshold frequency, is held constant. As a result,A. There are more electrons. B. The electrons are faster.C. Both A and B. D. Neither A nor B.arrow_forward1 In a Compton scattering experiment, photons are observed after scattering (from an electron at rest) by 120°. What is the wavelength of the incident (original) photons if the wavelength of the scattered photons is 65pm? O a. 65 pm O b. 61.35 pm Oc 66.22 pm O d. 68.645 pm O e. 63.79 pmarrow_forward
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