How far away can two point sources of wavelength 500 nm be if they are just resolved in a telescope of aperture 1.5 cm?
A. 25 km
B. 12 km
C. 90 m
D. 12 m
E. more information is needed
E. more information is needed
Physics & Space Science
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Indicate whether the statement is true or false
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The troposphere acquires most of its energy
content by a) latent heat transfer. b) Rayleigh scattering. c) absorption of terrestrial radiation. d) positive albedo changes.
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Which of these is NOT typical of the Galaxy's spiral arms?
A) open clusters B) Population II giants like orange Arcturus C) emission nebulae like M42 D) hot, young blue Population I stars E) O and B stars
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We don't hear the squeaks of bats because their sound is
A) of ultra-high frequencies. B) of ultra-high loudness. C) both of these D) neither of these
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