21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 22QP
To determine
Describe the importance of bright and dark lines that indicate about the atoms responsible for the spectral lines.
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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.
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.
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.
Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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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
- Go outside on a clear night, wait 15 minutes for your eyes to adjust to the dark, and look carefully at the brightest stars. Some should look slightly red and others slightly blue. The primary factor that determines the color of a star is its temperature. Which is hotter: a blue star or a red one? Explainarrow_forwardStar X has lines of ionized helium in its spectrum, and star Y has bands of titanium oxide. Which is hotter? Why? The spectrum of star Z shows lines of ionized helium and also molecular bands of titanium oxide. What is strange about this spectrum? Can you suggest an explanation?arrow_forwardExplain what Joseph Fraunhofer discovered about stellar spectra.arrow_forward
- Describe what happens to the blackbody spectrum as you increase or decrease the temperature. What happens to the shape of the curve and the peak of this curve? Explain it in a detailed way.arrow_forward3. 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_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_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_forwardThe spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is greater than its laboratory value of 656.3 nm, one can conclude that ... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. O C. The separation between Earth and the star is unchanging D. No conclusion is possible.arrow_forwardWhat lines would be missing for hydrogen in an absorption spectrum? What wavelengths are missing for hydrogen in an emission spectrum?arrow_forward
- Suppose you're experimenting with the spectrum produced by heated hydrogen gas. If you double the quantity of hydrogen and examine the resulting spectral lines, what is most likely to have changed? Group of answer choices The number of lines seen. The frequencies of the lines. The intensity of the lines. The pattern made by the lines. The wavelengths of the lines.arrow_forwardThe spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. C. The separation between Earth and the star is unchanging D. No conclusion is possible.arrow_forwardMatch the letter located in the digital spectra above (in the second picture) with the correct statement about each spectrum.1) Lines of neutral helium. Hydrogen lines moderately strong2) Hydrogen lines very strong and dominate the spectrum.3) Lines of ionized helium; most lines are weak because the star is so hot most electrons are removed from atoms and there are few atoms making transitions.4) Lines of neutral elements strongest. Singly ionized calcium lines are weaker, but still present.5) Lines of easily ionized elements like singly ionized calcium are strong; hydrogen lines are weak because it is not hot enough for hydrogen to be in the n=2 state.6) Singly ionized Calcium (393.0 nm) and a hydrogen line (434.0 nm) are about equal strength.7) Many lines of neutral elements and molecular states.arrow_forward
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