A typical white dwarf is
A) as massive as the Sun but only about as large in size as Earth.
B) as large in diameter as the Sun but only about as massive as Earth.
C) about the same size and mass as the Sun but much hotter.
D) as massive as the Sun but only about as large in size as Jupiter.
A) as massive as the Sun but only about as large in size as Earth.
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In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____
a. high-energy photons b. protons and antiprotons c. protons, neutrons, electrons, and positrons (anti-electrons) d. electrons, and positrons (anti-electrons) e. protons, neutrons, electrons
Which of the following statements are true for the Bohr model of the atom? (There could be more than one correct choice.)
A) The spacing between all the electron shells is the same. B) The energy difference between all the electron shells is the same. C) As we look at higher and higher electron shells, they get closer and closer together, but the difference in energy between them gets greater and greater. D) As we look at higher and higher electron shells, they get farther and farther apart, but the difference in energy between them gets smaller and smaller. E) There is no general pattern in the spacing of the shells or their energy differences.
A microscope that can view the surface of insulators with atomic resolution is
(a) A scanning electron microscope (b) A scanning tunneling microscope (c) A light optical microscope (d) An atomic force microscope
How is the geometry of an ellipse described?
What will be an ideal response?