Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 22, Problem 10Q
To determine
The reason for a hydrogen atom to emit a photon of wavelength 21 cm.
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A distant star has a peak wavelength of 0.00000077. What is the temperature of that star?
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Determine the energy of a cosmic rays' photon, if its wavelength is 1.24 x 10-14m?
(h = 6.63 x 10-34Js)
Group of answer choices
2.74 x 10-58J
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1.60 x 10-11J
Chapter 22 Solutions
Universe
Ch. 22 - Prob. 1CCCh. 22 - Prob. 2CCCh. 22 - Prob. 3CCCh. 22 - Prob. 4CCCh. 22 - Prob. 5CCCh. 22 - Prob. 6CCCh. 22 - Prob. 7CCCh. 22 - Prob. 8CCCh. 22 - Prob. 9CCCh. 22 - Prob. 10CC
Ch. 22 - Prob. 11CCCh. 22 - Prob. 12CCCh. 22 - Prob. 13CCCh. 22 - Prob. 14CCCh. 22 - Prob. 1CLCCh. 22 - Prob. 2CLCCh. 22 - Prob. 1QCh. 22 - Prob. 2QCh. 22 - Prob. 3QCh. 22 - Prob. 4QCh. 22 - Prob. 5QCh. 22 - Prob. 6QCh. 22 - Prob. 7QCh. 22 - Prob. 8QCh. 22 - Prob. 9QCh. 22 - Prob. 10QCh. 22 - Prob. 11QCh. 22 - Prob. 12QCh. 22 - Prob. 13QCh. 22 - Prob. 14QCh. 22 - Prob. 15QCh. 22 - Prob. 16QCh. 22 - Prob. 17QCh. 22 - Prob. 18QCh. 22 - Prob. 19QCh. 22 - Prob. 20QCh. 22 - Prob. 21QCh. 22 - Prob. 22QCh. 22 - Prob. 23QCh. 22 - Prob. 24QCh. 22 - Prob. 25QCh. 22 - Prob. 26QCh. 22 - Prob. 27QCh. 22 - Prob. 28QCh. 22 - Prob. 29QCh. 22 - Prob. 30QCh. 22 - Prob. 31QCh. 22 - Prob. 32QCh. 22 - Prob. 33QCh. 22 - Prob. 34QCh. 22 - Prob. 35QCh. 22 - Prob. 36QCh. 22 - Prob. 37QCh. 22 - Prob. 38QCh. 22 - Prob. 39QCh. 22 - Prob. 40QCh. 22 - Prob. 41QCh. 22 - Prob. 42QCh. 22 - Prob. 43QCh. 22 - Prob. 44QCh. 22 - Prob. 45QCh. 22 - Prob. 46QCh. 22 - Prob. 47QCh. 22 - Prob. 48QCh. 22 - Prob. 49QCh. 22 - Prob. 50Q
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- Hydrogen accounts for about 75% by mass of the matter at the surfaces of most stars. However, the absorption lines of hydrogen are strongest (of highest intensity) in the spectra of stars with a surface temperature of about 9000 K. They are weaker in the sun spectrum and are essentially nonexistent in very hot (temperatures above 25,000 K) or rather cool (temperatures below 3500 K) stars. Speculate as to why surface temperature affects the hydrogen absorption lines that we observe.arrow_forwardWhat force keeps the all stars from flying apart? (18.3) (a) nuclear force (b) gravitational force (c) radiation pressure (d) electrical forcearrow_forwardWhy 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_forward
- Consider a large interferometer that uses a lazer with the wavelength of 1,073.27 nm (1073.27 x 10-9m). What is the frequency of the photons emitted by this beam in hertz?arrow_forwardSuppose we detect red photons at 656 nm emitted by electrons dropping from the n = 3 to the n = 2 orbital in hydrogen. The hydrogen is in an interstellar cloud at 5000k. If the cloud were heted to 10000 K, what would be the wavelength of the photons emitted by the transition? a) 328 nm b) 656 nm c) 1312 nm d) 658 nm e) 654 nmarrow_forwardWhy is light is pure energy?arrow_forward
- In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. Find the speed for a star in which this line appears at wavelength 120.5 mm. What about at 122.4 nm? Express your answer to three significant figures and include the appropriate units.arrow_forwardAssuming that the Sun is a blackbody with a temperature of 6,000 K, at what wavelength does it radiate the most energy? [4.8 x 10‐7 m]arrow_forwardThe wavelength of a particular ultraviolet radiation from hydrogen atoms is 1.216 × 10-7 m. Calculate the wavelength when the corresponding radiation from hydrogen in a distant galaxy is observed here on earth. The galaxy is receding at a speed of 0.08 c.arrow_forward
- Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K? a. There is no hydrogen in stars this cool. 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 hydrogen atoms 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_forwardAs a beam of star light passes by the Sun, the Sun: Group of answer choices a)acts like a lens and bend the light direction slightly. b)reflect the star light rays away. c)absorbs the star light photons. d)acts like a black hole and prevents star light from escaping.arrow_forwardWhat will be the effect on the spectral lines of an object if it is moving only perpendicular to your line of sight? a. They will be redshifted. b. They will be blueshifted. c. They will be split. d. They will be broadened. e. There would be no effect.arrow_forward
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