Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 5, Problem 3E
Is your textbook the kind of idealized object (described in section on
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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.)
The maximum intensity of radiation emitted by a star occurs at a surface temperature of 4.3 x
104 K.
a) Calculate the wavelength of the emitted radiation when the intensity is maximum.
b) Calculate the ratio of the intensity radiated at a wavelength of 60.0 nm to the maximum
intensity.
Assume that the star radiates like an ideal blackbody.
you 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.
Chapter 5 Solutions
Astronomy
Ch. 5 - What distinguishes one type of electromagnetic...Ch. 5 - What is a wave? Use the terms wavelength and...Ch. 5 - Is your textbook the kind of idealized object...Ch. 5 - Where in an atom would you expect to find...Ch. 5 - Explain how emission lines and absorption lines...Ch. 5 - Explain how the Doppler effect works for sound...Ch. 5 - What kind of motion for a star does not produce a...Ch. 5 - Describe how Bohr’s model used the work of...Ch. 5 - Explain why light is referred to as...Ch. 5 - Explain the difference between radiation as it is...
Ch. 5 - What are the differences between light waves and...Ch. 5 - Which type of wave has a longer wavelength: AM...Ch. 5 - Explain why astronomers long ago believed that...Ch. 5 - Explain what the ionosphere is and how it...Ch. 5 - Which is more dangerous to living things, gamma...Ch. 5 - Explain why we have to observe stars and other...Ch. 5 - Explain why hotter objects tend to radiate more...Ch. 5 - Explain how we can deduce the temperature of a...Ch. 5 - Explain what dispersion is and how astronomers use...Ch. 5 - Explain why glass prisms disperse light.Ch. 5 - Explain what Joseph Fraunhofer discovered about...Ch. 5 - Explain how we use spectral absorption and...Ch. 5 - Explain the results of Rutherford’s gold foil...Ch. 5 - Is it possible for two different atoms of carbon...Ch. 5 - What are the three isotopes of hydrogen, and how...Ch. 5 - Explain how electrons use light energy to move...Ch. 5 - Explain why astronomers use the term “blueshifted”...Ch. 5 - If spectral line wavelengths are changing for...Ch. 5 - Make a list of some of the many practical...Ch. 5 - With what type of electromagnetic radiation would...Ch. 5 - Why is it dangerous to be exposed to X-rays but...Ch. 5 - Go outside on a clear night, wait 15 minutes for...Ch. 5 - Water faucets are often labeled with a red dot for...Ch. 5 - Suppose you are standing at the exact center of a...Ch. 5 - How could you measure Earth’s orbital speed by...Ch. 5 - Astronomers want to make maps of the sky showing...Ch. 5 - The greenhouse effect can be explained easily if...Ch. 5 - An idealized radiating object does not reflect or...Ch. 5 - Why are ionized gases typically only found in very...Ch. 5 - Explain why each element has a unique spectrum of...Ch. 5 - What is the wavelength of the carrier wave of a...Ch. 5 - What is the frequency of a red laser beam, with a...Ch. 5 - You go to a dance club to forget how hard your...Ch. 5 - What is the energy of the photon with the...Ch. 5 - If the emitted infrared radiation from Pluto, has...Ch. 5 - What is the temperature of a star whose maximum...
Additional Science Textbook Solutions
Find more solutions based on key concepts
11. A rubber balloon has a single point charge in its interior. Does the electric flux through the balloon depe...
College Physics (10th Edition)
Explain all answers clearly, with complete sentences and proper essay structure if needed. An asterisk (*) desi...
The Cosmic Perspective Fundamentals (2nd Edition)
Centrifuges are widely used in biology and medicine to separate cells and other particles from liquid suspensio...
Essential University Physics: Volume 1 (3rd Edition)
14. a. Compute the binding energy of the reactants and of the products in the nuclear fusion reaction 2H + 6Li ...
College Physics: A Strategic Approach (4th Edition)
6. A wire carries a 4 A current. What is the current in a second wire that delivers twice as much charge in hal...
College Physics: A Strategic Approach (3rd Edition)
Write each number in scientific notation.
12. 0.00224
Applied Physics (11th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Question A7 The intensity of the emitted radiation by a star is at a maximum at a wavelength of 78.9 nm. a) Calculate the surface temperature of the star. b) Calculate the ratio of the intensity radiated at 65.0 nm to the maximum intensity. Assume that the star radiates like an ideal blackbody.arrow_forwarddocs.google.com a Q.4 A- Define a blackbody, discuses experimental data for the distribution of energy in blackbody radiation at three temperatures. B- A surveyor uses a steel measuring tape that is exactly 15.000 m long at a temperature of 30°C. The markings on the tape are calibrated for this temperature. (a) What is the length of the tape when the temperature is 35°C? (b) When it is 45°C, the surveyor uses the tape to measure a distance. The value that she reads off the tape is 40.794 m. What is the actual distance?arrow_forwardA large cavity that has a very small hole and is maintained at a temperature T is a good approximation to an ideal radiator or blackbody. Radiation can pass into or out of the cavity only through the hole. The cavity is a perfect absorber, since any radiation incident on the hole becomes trapped inside the cavity. Such a cavity at 400°C has a hole with area 4.00 mm2. How long does it take for the cavity to radiate 100 J of energy through the hole?arrow_forward
- The intensity of blackbody radiation peaks at a wavelength of 583 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature. Review Stefan's law. What is the emissivity of a blackbody? W/m2arrow_forwardA large cavity that has a very small hole and is maintained at a temperature T is a good approximation to an ideal radiator or blackbody. Radiation can pass into or out of the cavity only through the hole. The cavity is a perfect absorber, since any radiation incident on the hole becomes trapped inside the cavity. Such a cavity at 500 .C has a hole with area 5.00 mm?. How long does it take for the cavity to radiate 300 J of energy through the hole?arrow_forwardSuppose a hot object radiates with the twice the intensity as the sun on earth, i.e. 2600W/m2. What is the energy density of this radiation?arrow_forward
- Consider an experiment where a Blackbody (Blackbody radiation) is studied. The radiators are heated up by absorbing incident light and cool down when they emit light, reaching a specific temperature at equilibrium. Assume for all parts that the equilibrium temperature of the Blackbody radiator is 8000K. a) How much energy is emitted per second by the blackbody (i.e., what is the power it emits)? What is the nature of emitted energy (hint: the answer is more precise than just saying “heat”)? b) What is the intensity distribution at a frequency of 230x10^12 Hz? Calculate this both for Rayleigh-Jeans and Planck form of the distribution. c) Is a larger fraction of the energy emitted at a frequency of 230x10^12 Hz for the Rayleigh- Jeans or Planck distribution? Briefly explain why. d) We will now consider “graybody” radiation, where the graybody object reflects 5% of the light (i.e., it does not absorb all the light incident on it). However, since the absorptivity and emissivity are…arrow_forwardThe temperature of an electric heating element is 150°C. At what wavelength does the radiation emitted from the heating element reach its peak? Model the tungsten filament of a lightbulb as a black body at temperature 2 900 K. (a) Determine the wave- length of light it emits most strongly. (b) Explain why the answer to part (a) suggests that more energy from the lightbulb goes into infrared radiation than into vis- ible light.arrow_forwardQUESTION1: Stefan-Boltzman law can be used to estimate H emitted from a surface where H = AeoT, where H = surface area (m2) in units of watts, e = diffusivity characterizing the spreading properties of the surface, o = a universal constant called the Stefan-Boltzman constant. (-5.67x108 W m?K4) and T = absolute temperature (K). a) Determine the error of the radiation H of a steel sphere surface with radius = 0.15 + 0.02 m, e 0.90+ 0.05 and T = 550 ± 25 K. Compare your results with the exact error. Calculations b) radius = 0.15 0.01 m, e 0.90 +0.025 Repeat for T = 550 12.5 K. and Interpret your results.arrow_forward
- A small body is placed inside of a spherical stainless steel chamber with a diameter of 3 m. The chamber is evacuated and has a constant surface temperature of 500 K. Determine the radiation incident on the surface of the small body inside the chamber if the interior surface of the chamber is (a) coated black and (b) well-polished.arrow_forwardThe Earth reradiates the energy it receives from the Sun as a black body. We can calculate the effective temperature of the Earth using the Stefan-Boltzmann equation F = sT4 where we solve for the Temperature T. We use for the energy flux the amount of energy absorbed per second Le divided by the Earth's surface area from which the energy is radiated 4pd2 so that the flux is = Le/(4pd2). Here d is the radius of the Earth given above and s is the Stefan-Boltzmann constant. And the effective temperature is:Te4 = (Le/(4pd2))/s = Le/(4spd2) = __________________ K4and taking the square root of Te4 twice in succession we get the effective Temperature Te:Te = [Le/(4spd2)]0.25 = _________________ Kfor the temperature of the effective Earth. What is the temperature in the Celsius scale? __________ C. (Do I need to tell you how to convert from Kelvin to Celsius? If you don't know look it up in your textbook!!)arrow_forwardSuppose someone is running a fever of 102.0° F (average being 98.6° F). How much more power (in Watts) does this person radiate than when this person is at normal human body temperature, assuming the fever causes no swelling or edema, or emaciation? Remember that for thermal radiators, intensity I = sigma T^4; where sigma is the Stefan-Boltzmann constant and T is temperature in Kelvins.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
