Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 10, Problem 3QAP
To determine
Whether the statement is true or false.
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Clouds of hydrogen in space often emit light with a wavelength of 656.3 nanometers. This type of light is emitted from galaxies that are moving away from Earth at great speed. When astronomers detect photons of this type from those galaxies, those photons of light will,
have a longer wavelength and more energy than the emitted light
or
have a longer wavelength and less energy than the emitted light
Two starships, the Enterprise and the Constitution, are approaching each other head-on from a great distance. The separation between them is decreasing at a rate of 812.5 km/skm/s. The Enterprise sends a laser signal toward the Constitution.
If the Constitution observes a wavelength λ=675.3nm, what wavelength was emitted by the Enterprise?
Express your answer to four significant figures and include appropriate units.
If one star has a temperature of 5,000 K and another star has a temperature of 8,500 , how much more energy per second will the hotter star radiate from each square meter of its surface? (asks for the difference, not ratio)
Chapter 10 Solutions
Understanding Our Universe
Ch. 10.1 - Prob. 10.1CYUCh. 10.2 - Prob. 10.2CYUCh. 10.3 - Prob. 10.3CYUCh. 10.4 - Prob. 10.4CYUCh. 10 - Prob. 1QAPCh. 10 - Prob. 2QAPCh. 10 - Prob. 3QAPCh. 10 - Prob. 4QAPCh. 10 - Prob. 5QAPCh. 10 - Prob. 6QAP
Ch. 10 - Prob. 7QAPCh. 10 - Prob. 8QAPCh. 10 - Prob. 9QAPCh. 10 - Prob. 10QAPCh. 10 - Prob. 11QAPCh. 10 - Prob. 12QAPCh. 10 - Prob. 13QAPCh. 10 - Prob. 14QAPCh. 10 - Prob. 15QAPCh. 10 - Prob. 16QAPCh. 10 - Prob. 17QAPCh. 10 - Prob. 18QAPCh. 10 - Prob. 19QAPCh. 10 - Prob. 20QAPCh. 10 - Prob. 21QAPCh. 10 - Prob. 22QAPCh. 10 - Prob. 23QAPCh. 10 - Prob. 24QAPCh. 10 - Prob. 25QAPCh. 10 - Prob. 26QAPCh. 10 - Prob. 27QAPCh. 10 - Prob. 28QAPCh. 10 - Prob. 29QAPCh. 10 - Prob. 31QAPCh. 10 - Prob. 32QAPCh. 10 - Prob. 33QAPCh. 10 - Prob. 34QAPCh. 10 - Prob. 35QAPCh. 10 - Prob. 36QAPCh. 10 - Prob. 37QAPCh. 10 - Prob. 38QAPCh. 10 - Prob. 39QAPCh. 10 - Prob. 40QAPCh. 10 - Prob. 41QAPCh. 10 - Prob. 42QAPCh. 10 - Prob. 43QAPCh. 10 - Prob. 44QAPCh. 10 - Prob. 45QAP
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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_forwardThe power in two beams, each of different wavelengths (1200nm and 400nm) are equal to 4.4 mW. The energy of a photon with a wavelength of 1.2 microns is _____ the energy of a photon with a wavelength of .40 microns. a) b) c) d) e) f)arrow_forwardCool hydrogen emits a radio signal at the specific wavelength of 21 cm. What is the energy associated with this wavelength and how does it compare to the energy emitted by a photon of red light of wavelength 700 nm?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_forwardA mole contains 6.02 * 1023 particles (atoms, molecules, etc.). If you wanted to reach Alpha Centauri (4.367 light-years away) by creating a strand of carbon atoms (0.3 nm diameter), how many moles of carbon would you need? (Note: 1 light-year = 9.46 * 1012km)arrow_forwardEven though neutral hydrogen is the most abundant element in interstellar matter, it was detected first with a radio telescope, not a visible light telescope. Explain why. (The explanation given in Analyzing Starlight for the fact that hydrogen lines are not strong in stars of all temperatures may be helpful.)arrow_forward
- Why is it difficult to determine where cosmic rays come from?arrow_forwardWhich two spectral types were added to the spectral sequence after 1998? a. O and B b. K and M c. L and T d. Y and Z e. J and Qarrow_forwardA star has an element in its atmosphere that normally emits a line of frequency fs = 7.5 x 10^14 vib/s. If astronomers measure the frequency of this line to be fo = 7.7 x 10^14 vib/s, then how fast are the Earth and this star traveling relative to each other? Remember that the correct equation for the speed v is given by v = [(fo^2 - fs^2) / (fo^2 + fs^2)] c Remember fo^2 means "fo squared."arrow_forward
- As 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_forwardEverything radiates electromagnetic energy. Classify the object with its peak ligth emission.An average star (like sun): _____Element of your oven at max: _______Bright incandescent light bulb: Infrared and_______Hot volcano lava: ______Human body: ______Animals: ______Gamma emission emitted by a radioactive decay: Hard X-Ray and ______The radiant heat remaining from the Big Bang: ______Black light: ______ Options are: X-ray, Visible light, Infrared, Microwave, Ultraviolet, Radio Wave, Gamma Ray Please show work! Thank you!!arrow_forwardWhy 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_forward
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