What do we mean by the diffraction limit of a telescope?
A) It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images.
B) It describes the farthest distance to which the telescope can see.
C) It is the maximum size to which any telescope can be built.
D) It describes the maximum exposure time for images captured with the telescope.
A) It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images.
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A sprinter named Ben has challenged a beam of light to a race in the 100-m dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens?
A) The light beam moves out ahead of him at the full speed of light, winning the race easily. B) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. C) The light beam instantly finishes the race, before Ben even has a chance to start. D) Ben wins the race and becomes a hero.
The variation in the pressure of helium gas, measured from its equilibrium value, is given by ?P = 2.9 × 10^?5 cos (6.20x ? 3 000t) where x and t have units m and s. Determine the speed (in m/s) of the wave
a. 1 515 b. 153 c. 484 d. 828 e. 101
Like Herbig-Haro objects associated with protostars, the lobes around radio galaxies are the result of ________ streaming from the active nucleus. Describe their alignment
Fill in the blank(s) with correct word
What is interesting about Jupiter's rotation period?
A) It is the same as Earth's. B) It is the same as its orbital period. C) It is the same as the Sun's. D) It is the slowest in the solar system. E) It is the fastest in the solar system.