If there around 10,000 transmitting civilizations in the Milky Way, then theoretically the Allen Telescope Array, when it is complete, might be capable of detecting a signal within a few

A) years
B) centuries
C) months
D) decades


D

Physics & Space Science

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When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:

A) would contract slightly. B) would reduce its central temperature. C) would reduce its density. D) would increase the mass by a factor of 2.

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Why has Mercury traditionally been such a hard planet to observe and study?

What will be an ideal response?

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Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart

Half way between the two plates the electric field has magnitude E. If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates? A) 4E B) 2E C) E D) 0 E) E/2

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Which one of the following mathematical expressions is correct for destructive interference for two beams of light in the double slit experiment?

A) Path Difference = (m - 1/2 ) ?, m = 0, ±1, ±2, . . . B) Path Difference = ?/m, m = 0, ±1, ±2, . . . C) Path Difference = m?, m = 0, ±1, ±2, . . . D) Path Difference = m?2, m = 0, ±1, ±2, . . . E) Path Difference = m/?, m = 0, ±1, ±2, . . .

Physics & Space Science