Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 7, Problem 18RQ
To determine
The nature of neon sign and the colors associated with a neon sign.
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State whether it is true that “the A spectrum is AM0 and the B spectrum is AM1.5”. Explain why B is weaker than A across the whole wavelength range. Show how you estimate the surface temperature of the Sun using the given spectrum.
Choose the correct statements concerning the electromagnetic spectrum given off by stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) Blue photons are more energetic than red photons.
B) A hot star will be more red in color than a cooler star.
C) All stars are the same color as our Sun.
D) Hot stars are much brighter than cool stars of the same size and distance from the Earth.
E) If we see a blue star and a red star in a nearby star cluster, we know the red star is hotter.
F) Blue photons (blue light) have a longer wavelength than red photons.
a. Does a hot, thin gas emit a continuous spectrum, a bright line spectra with gaps between
the lines, or a dark line spectra with all frequencies except the missing (absorbed) one?
b. Why do we see dark line spectra when we look at stars?
c. Both hydrogen and helium glow and absorb red. Are they the same frequency of red?
d. A hot solid iron plate and a hot solid aluminum plate are the same temperature. Do the
give off the same range of frequencies?
Chapter 7 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - Prob. 9RQCh. 7 - Prob. 10RQ
Ch. 7 - Prob. 11RQCh. 7 - Prob. 12RQCh. 7 - Prob. 13RQCh. 7 - Prob. 14RQCh. 7 - Prob. 15RQCh. 7 - Prob. 16RQCh. 7 - How is heat different from temperature?Ch. 7 - Prob. 18RQCh. 7 - Prob. 19RQCh. 7 - Prob. 20RQCh. 7 - Prob. 21RQCh. 7 - Prob. 22RQCh. 7 - Could an object be orbiting another object and we...Ch. 7 - Prob. 24RQCh. 7 - How Do We Know? How is the macroscopic world you...Ch. 7 - Prob. 1PCh. 7 - Answer these questions for celestial bodies at...Ch. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 12PCh. 7 - Prob. 1SOPCh. 7 - Prob. 2SOPCh. 7 - Prob. 1LTLCh. 7 - Prob. 2LTLCh. 7 - Prob. 3LTLCh. 7 - Prob. 4LTLCh. 7 - Prob. 5LTLCh. 7 - Prob. 6LTLCh. 7 - Prob. 7LTL
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- Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K? a. There is no hydrogen in stars this hot. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.arrow_forward1. The temperature of stars in the universe varies with the type of star and the age of the star among other things. By looking at the shape of the spectrum of light emitted by a star, we can tell something about its average surface temperature. a. If we observe a star's spectrum and find that the peak power density occurs at the border between red and infrared light, what is the approximate surface temperature of the star? (Remember to include units)Incorrectb. If we observe a star’s spectrum and find that the peak power density occurs at the border between blue and ultraviolet light, what is the surface temperature of the star? (Remember to include units)Incorrect Submit QuestionQuestion 1arrow_forward8. A. What is the name of Instrument A below? Spectroscope Instrument A B. If you use this instrument to look at white light, what will you see? all the colors of the C. What is happening at the atomic level to cause each line below? (Be specific) D. The Ne emission spectrum is shown below. What is the difference between what you would observe when looking at a Ne light without and with instrument A? Ne 4000 5000 6000 7000arrow_forward
- Three prominent spectral lines of wavelength a are observed at 499nm, 508nm, and 523nm. What is the most likely composition of this sample? Select one: О а. Helium b. Lithium Ос. Нydrogen O d. Chlorine е. Охудen f. Neonarrow_forwardAn incandescent light bulb and thin gas cloud are in space. From which point of view would an observer see an absorption line spectrum? (C) (A) → + (D) (B) A. A ОВ. В O C. C D.Darrow_forwardExplain the fluorescence process. Be sure to include an explanation of why fluorescence is always red-shifted from UV-Vis Spectrum of the substance?arrow_forward
- The Pfund series in the hydrogen spectrum corresponds to transitions that have a final state of m=5. A. What are the wavelengths of the first three lines in this series? Express your answers in micrometers to three significant figures. Enter your answers in descending order separated by commas. B. What part of the electromagnetic spectrum are these lines in?arrow_forwardWhat type of spectrum is observed in the light from the sun and other stars? a continuous spectrum consisting of all colors. an emission spectrum. an absorption spectrum consisting of dark lines in a continuous bright background. an atomic spectrum of hydrogen.arrow_forwardThe visible spectrum of sunlight shows a range of colors from red to violet. This spectrum has numerous dark lines spread throughout it. Noting that the surface of the Sun is much cooler than the interior, so that the surface is comparable to a cool gas through which light passes, which a. The cooler, denser surface material scatters certain wavelengths of light, forming dark lines. b. The atoms at the surface absorb certain wavelengths of light, causing the dark lines at those wavelengths. c. The atoms in the Sun’s interior emit light of specific wavelength, so that parts of the spectrum are dark. d. The atoms at the surface are excited by the high interior temperatures, so that the dark lines are merely wavelengths at which those atoms don’t emit energy.arrow_forward
- 3. Diagram "H" shows the absorption spectrum of hydrogen, while "X", "Y" and "Z" are part of the absorption spectra from 3 different stars. blue yellow red H Star X Star Y Star Z State how each spectrum differs from "H" and what that reveals about the motion of the stars X, Y and Z.arrow_forwardNormal human body temperature is about 37°C. What is this temperature in kelvins? What is the peak wavelength emitted by a person with this temperature? What color is this? Explainarrow_forward1. The temperature of stars in the universe varies with the type of star and the age of the star among other things. By looking at the shape of the spectrum of light emitted by a star, we can tell something about its average surface temperature. a. If we observe a star's spectrum and find that the peak power density occurs at the border between red and infrared light, what is the approximate surface temperature of the star? (Remember to include units)b. If we observe a star’s spectrum and find that the peak power density occurs at the border between blue and ultraviolet light, what is the surface temperature of the star? (Remember to include units) Submit QuestionQuestion 1arrow_forward
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