Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 10, Problem 11Q
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(a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced?
1.1679e32 X
How does power relate to energy? Review the relationship between energy and frequency of a photon. 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.
2.138e21
If there is no reflection by the ground, what fraction of the radiated power reaches the receiver? What portion of the
spherical surface do you need to consider here? photons/(s · m2)
Additienel Mete niel
A) Astronomers measure the peak wavelength of a nearby star to be 410 nm. What is the star's temperature?
B) How much energy does a single photon of light have at this wavelength?
C) An electron bound in an unknown metal requires 1.45E-19 ] of energy under the photoelectric effect
to become free of the metal. How much kinetic energy would it have if struck by the photon froft
part (b)?
D) What is the final speed of the elctron from part (c)?
Chapter 10 Solutions
Inquiry into Physics
Ch. 10 - Prob. 1SACh. 10 - Prob. 1OACh. 10 - Prob. 1PIPCh. 10 - Prob. 1MIOCh. 10 - Prob. 2MIOCh. 10 - Prob. 1QCh. 10 - Prob. 2QCh. 10 - Prob. 3QCh. 10 - Prob. 4QCh. 10 - Prob. 5Q
Ch. 10 - Prob. 6QCh. 10 - Prob. 7QCh. 10 - Prob. 8QCh. 10 - Prob. 9QCh. 10 - Prob. 10QCh. 10 - Prob. 11QCh. 10 - (Indicates a review question, which means it...Ch. 10 - Prob. 13QCh. 10 - Prob. 14QCh. 10 - (Indicates a review question, which means it...Ch. 10 - Prob. 16QCh. 10 - Prob. 17QCh. 10 - Prob. 18QCh. 10 - Prob. 19QCh. 10 - Prob. 20QCh. 10 - Prob. 21QCh. 10 - Prob. 22QCh. 10 - Prob. 23QCh. 10 - Prob. 24QCh. 10 - Prob. 25QCh. 10 - Prob. 26QCh. 10 - Prob. 27QCh. 10 - Prob. 28QCh. 10 - Prob. 29QCh. 10 - Prob. 30QCh. 10 - Prob. 31QCh. 10 - Prob. 32QCh. 10 - Prob. 33QCh. 10 - Prob. 34QCh. 10 - Prob. 35QCh. 10 - Prob. 36QCh. 10 - Prob. 37QCh. 10 - Prob. 38QCh. 10 - Prob. 39QCh. 10 - Prob. 40QCh. 10 - Prob. 41QCh. 10 - Prob. 42QCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - . Figure 10.47 is the energy-level diagram for a...Ch. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - Prob. 18PCh. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Prob. 23PCh. 10 - Prob. 1CCh. 10 - Prob. 2CCh. 10 - The rate at which solar wind particles enter the...Ch. 10 - Prob. 4CCh. 10 - Prob. 5CCh. 10 - Prob. 6C
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- What is the energy of a photon whose momentum is 3.01024 kg• m/s ?arrow_forward(a) Write the important properties of photons which are used to establish Einstein’s photoelectric equation. (b) Use this equation to explain the concept of (i) threshold frequency and (ii) stopping potential.arrow_forwardyou are sitting at a desk in a completely dark room. the room is at normal indoor room temperature. there is an inanimate and un-powered object on your desk (e.g., a box, pencil case, notebook,...). what wavelength of blackbody radiation is emitted from that object with greatest intensity? (assume the object has the same temperature as the rest of the room.) express your answer in microns.arrow_forward
- Question #1 a) Plot the energy spectral density p(2) of black-body radiation at T=3000 K and at 7= 5000 K. (These correspond to the apparent temperatures of "warm white" and "cool white" light bulbs.) (Note: Show both curves on a single graph, using a standard plotting software. Report the wave- length in nanometers.) b) For each of these two temperatures, at which wavelength is the radiation intensity maximum? (Note: Report the wavelengths in nanometers. Your answers should be consistent with the curves from part a), of course.)arrow_forwardDefine the terms (i) ‘cut-off voltage’ and (ii) ‘threshold frequency’ in relation to the pheno-menon of photoelectric effect. Using Einstein’s photoelectric equation show how the cut-off voltage and threshold frequency for a given photosensitive material can be determined with the help of a suitable plot/graph.arrow_forwardAlthough electromagnetic waves can always be represented as either photons or waves, in the radio part of the spectrum we typically do not discuss photons (like we do in the visible) because they are at such a low energy. Nevertheless, they exist. Consider such a photon in a radio wave from an AM station has a 1540 kHz broadcast frequency. (a) What is the energy, in joules, of the photon? (b) What is the energy, in electron volts, of the photon?arrow_forward
- My question is: What is the frequency and wavelength of a 50 meV gamma-ray photon? How do I find it?arrow_forwardA beam of light with wavelength 6500 Angstrom and carrying the energy 105 ergs per second falls on a photoelectric cell and is completely used in the production of photoelectrons. (This is about the energy of the light from the sun and sky on a bright day that strikes an area of 1 cm2) What is the magnitude of the photoelectric current that then flows in the circuit of which the photoelectric cell is a part?arrow_forwardPhotons of a certain infrared light have an energy of 1.76 10-19 J. (a) What is the frequency of this IR light? (b) Use ? = c/f to calculate its wavelength in nanometers.arrow_forward
- Suppose a company wanted to develop an electricity-generating device based on the Earth as a blackbody. This temperature of 35°C at night. What would be the work function of a metal that could produce photoelectrons from the peak wavelength of the Earth's blackbody radiation at this temperature? What would be the kinetic company chose to base its operations in Death Valley, California, whose summers see a surface energy of a photoelectron produced by light half this wavelength?arrow_forwardQuick response will be upvoted.arrow_forwardAs you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump from one part of the object to another. The other friend says that the sparks are caused by the photoelectric effect. Prove or disprove the latter idea using basic physics. Suppose the typical work function of the metal is roughly 3.630 × 10-19 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal. wavelength: Åarrow_forward
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