If the density of the universe is at the critical density, then the geometry of the universe would follow ordinary Euclidean geometry
Indicate whether the statement is true or false
TRUE
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Suppose the star Betelgeuse (the upper left shoulder of Orion) were to become a supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. B) Because the supernova event destroys the star, Betelgeuse would suddenly disappear from view. C) Betelgeuse would remain a dot of light but would suddenly become so bright that, for a few weeks, we'd be able to see this dot in the daytime. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full moon. It would also be about as bright as the full moon.
As a water wave approaches a shoreline, wave speed
A) increases. B) decreases. C) is unchanged. D) and wavelength increase.
Sunlight reflected from the surface of a lake
A) is unpolarized. B) tends to be polarized with its electric field vector parallel to the surface of the lake. C) has undergone refraction by the surface of the lake. D) tends to be polarized with its electric field vector perpendicular to the surface of the lake. E) is totally polarized.
A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then filled with a diamagnetic material. What changes will this make to the magnetic field along the axis of the solenoid?
A) The field will point in the -x direction with a smaller magnitude. B) The magnetic field will not change. C) The field will point in the same direction with a larger magnitude. D) The field will have the same magnitude but will now point in the -x direction. E) The field will point in the same direction with a smaller magnitude.