How many atoms fit across the period at the end of this sentence?
A) hundreds
B) thousands
C) millions
D) billions
E) more than you could count in a lifetime
Answer: C
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Astronomy Chapter 5
- An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
- Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
- Suppose that two stars are identical in every way—for example, same distance, same mass, same temperature, same chemical composition, and same speed relative to Earth—except that one star rotates faster than the other. Spectroscopically, how could you tell the stars apart?
- Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?
- If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?
- Suppose that Star X and Star Y both have redshifts, but Star X has a larger redshift than Star Y. What can you conclude?
- Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?
- All of the following statements about the Sun's corona are true. Which one explains why it is a source of X rays?
- The planet Neptune is blue in color. How would you expect the spectrum of visible light from Neptune to be different from the visible-light spectrum of the Sun?
- Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
- Which of the following statements about thermal radiation is always true?
- No object produces a perfect thermal radiation spectrum, but many objects produce close approximations. Which of the following would not produce a close approximation to a thermal radiation spectrum?
- Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?
- Which of the following statements about electrons is not true?
- Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?
- Suppose you had molecular oxygen (O2) chilled enough so that it was in liquid form. Which of the following best describes the phase changes that would occur as you heated the liquid oxygen to high temperature?
- Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?
- Which of the following statements about X rays and radio waves is not true?
- Which of the following best describes why we say that light is an electromagnetic wave?
- Suppose a photon has a frequency of 300 million hertz (300 megahertz). What is its wavelength?
- An atom that has fewer electrons than protons is called a/an
- Which of the following transitions within an atom is not possible?
- Sublimation is the process in which
- An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
- Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?