Which of the following statements about novae is not true?
A) The word nova means "new star" and originally referred to stars that suddenly appeared in the sky, then disappeared again after a few weeks or months.
B) When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova.
C) Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now.
D) A star system that undergoes a nova may have another nova sometime in the future.
E) A nova involves fusion taking place on the surface of a white dwarf.
C
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Consider a flat steel plate with a hole through its center. When the plate's temperature is decreased, the hole will
A) contract only if it takes up more than half the plate's surface area. B) expand if it takes up less than half the plate's surface area. C) contract. D) expand.
Two parallel conductors are carrying currents in the same direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 ?T. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. a value greater than 40 ?T b. 40 ?T c. a value less than 40 ?T d. It could be any value.
The shorter the wavelength of light, the higher its frequency
Indicate whether the statement is true or false
The ultimate speed of a solar-sail-propelled spacecraft is limited by the
A) low energy photons that the Sun produces B) gravitational force of the Sun C) fact that the intensity of sunlight falls off rapidly with distance D) mass of the spacecraft