The celestial sphere is divided into 88 modern constellations
Indicate whether the statement is true or false
TRUE
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If each copper atom in a wire were to contribute two conduction electrons instead of just one, its conductivity would
A. increase by a factor of 4. B. increase by a factor of 2. C. remain the same. D. decrease by a factor of 2. E. decrease by a factor of 4.
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 55 km/s/Mpc
How fast would a galaxy located 500 megaparsecs distant be receding from us? Show all work clearly, and state your final answer with a complete sentence. Give the speed in units of kilometers per second and as a percentage of the speed of light.
How is the solubility of a solid affected by temperature?
A) As temperature goes up, the solubility goes up. B) As temperature goes down, the solubility goes down. C) As temperature goes up, the solubility goes down. D) As temperature goes down, the solubility goes up. E) both A and B
Which two classes of objects were critical to the Shapley-Curtiss Debate of 1920?
A) white dwarfs and red giants B) open clusters and emission nebulae C) globular clusters and spiral nebulae D) emission nebulae and spiral nebulae E) planetary nebulae and white dwarfs