Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 5, Problem 17E
Explain why hotter objects tend to
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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...
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- Determine the power intensity of radiation per unit wavelength emitted at a wavelength of 500.0 nm by a blackbody at a temperature of 10,000 K.arrow_forwardCheck Your Understanding An iron poker is being heated. As its temperature rises, the poker begins to glow-first dull red, then bright red, then orange, and then yellow. Use either the blackbody radiation curve or Wien’s law to explain these changes in the color of the glow.arrow_forwardExplain the color changes in a hot body as its temperature is increased.arrow_forward
- An idealized radiating object does not reflect or scatter any radiation but instead absorbs all of the electromagnetic energy that falls on it. Can you explain why astronomers call such an object a blackbody? Keep in mind that even stars, which shine brightly in a variety of colors, are considered blackbodies. Explain why.arrow_forwardPhotons of a certain ultraviolet light have an energy of 6.77 10-19 J. What is the frequency of this UV light? Use ? = c/f to calculate its wavelength in nanometers?arrow_forwardCalculate the momentum (in kg · m/s) of a photon having a wavelength of 99.2 nm. How does it compare with the energy of the photon? Ephoton KEelectron =arrow_forward
- Water absorbs infrared radiation with wavelengths near 4.55 mm. Suppose this radiation is absorbed by the water and converted to heat. A 2.25-L sample of water absorbs infrared radiation, and its temperature increases from 17.0°C to 35.0°C. How many photons of this radiation are used to heat the water?arrow_forwardLightning produces a maximum air temperature on the order of 9.7 ✕ 103 K, whereas a nuclear explosion produces a temperature on the order of 9.6 ✕ 106 K. Use Wien's displacement law to calculate the wavelength of the thermally-produced photons radiated with greatest intensity by each of these sources. Select the part of the electromagnetic spectrum where you would expect each to radiate most strongly. (a) lightning ?max ≈ nm It radiates most strongly in the part of the spectrum. (b) nuclear explosion ?max ≈ pm It radiates most strongly in the part of the spectrum.arrow_forwardDoes a beam of infrared photons always have less energy than a beam of ultraviolet photons? Explain.arrow_forward
- Photons of a certain infrared light have an energy of 1.21X 10^-19 J. What is the frequency of this IR light? Use ? = c/f to calculate its wavelength in nanometers.arrow_forwardCalculate the energy associated with a photon of blue light with a wavelength of 485nmarrow_forwardCalculate the wavelength of a photon having an energy of 5.89 x 10^11 J of energy. E = hc/λ You must show a correct numerical setup and your answer must include the correct mathematical unit.arrow_forward
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