Pearson eText -- Physics for Scientists and Engineers with Modern Physics -- Instant Access (Pearson+)
5th Edition
ISBN: 9780137488179
Author: Douglas Giancoli
Publisher: PEARSON+
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Question
Chapter 37, Problem 1Q
To determine
The relative temperatures of stars
Expert Solution & Answer
Answer to Problem 1Q
The reddish star is coolest, bluish star is hottest and whitish-yellow star temperature is greater than reddish star and lesser than bluish star.
Explanation of Solution
Color of the star determines its temperatures. Since, the temperature is related to the frequency of the emitted light, the light with greater frequency has greater temperature and the light with lesser frequency has lesser temperature.
Among red, whitish-yellow, and blue color, red color is at the lowest frequency, followed by a whitish-yellow. Blue color is at highest frequency. Therefore, the reddish star is coolest, bluish star is hottest and whitish-yellow star temperature is greater than reddish star and lesser than bluish star.
Conclusion:
Therefore, hottest star among the three is bluish star, the coolest is reddish star, and the whitish- yellow star is in between the bluish and reddish star.
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What can be said about the relative temperatures of whitish-yellow, reddish, and bluish stars? Explain.
9. (a) The diagram shows the lowest four energy levels of a hydrogen atom.
Energy / eV
-0.85
-1.5
-3.4
-13.6
Excited hydrogen atoms can emit light of wavelength 6.56 x 10-7 m.
i. Calculate the frequency of this light and hence the energy, in Joules, of a photon
of this wavelength.
ii. An electron made a transition between which levels for this photon to be emitted?
(b) Calculate the wavelength of the photon emitted with the greatest energy.
(c) Explain the difference in meaning between an ionised atom and an excited atom.
(2)
(3)
(4)
(3)
An atom X makes a transition from the orbit with n=2 to the orbit with n=1. Using theBohr model, determine the wavelength of light if the atom X is:i. Hydrogen (Z=1)ii. Lithium (Z=3)
Chapter 37 Solutions
Pearson eText -- Physics for Scientists and Engineers with Modern Physics -- Instant Access (Pearson+)
Ch. 37 - Prob. 1QCh. 37 - Prob. 2QCh. 37 - Prob. 3QCh. 37 - Prob. 4QCh. 37 - Prob. 5QCh. 37 - Prob. 6QCh. 37 - Prob. 7QCh. 37 - Prob. 8QCh. 37 - Prob. 9QCh. 37 - Prob. 10Q
Ch. 37 - Prob. 11QCh. 37 - Prob. 12QCh. 37 - Prob. 13QCh. 37 - Prob. 14QCh. 37 - Prob. 15QCh. 37 - Prob. 16QCh. 37 - Prob. 17QCh. 37 - Prob. 18QCh. 37 - Prob. 19QCh. 37 - Prob. 20QCh. 37 - Prob. 1PCh. 37 - Prob. 3PCh. 37 - Prob. 7PCh. 37 - Prob. 9PCh. 37 - Prob. 13PCh. 37 - Prob. 25PCh. 37 - Prob. 26PCh. 37 - Prob. 27PCh. 37 - Prob. 32PCh. 37 - Prob. 34PCh. 37 - Prob. 37PCh. 37 - Prob. 45PCh. 37 - Prob. 52PCh. 37 - Prob. 76GPCh. 37 - Prob. 77GP
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