A beam of light of wavelength 610 nm passes through a slit that is 1.90 µm wide. At what the angle away from the centerline does the first dark fringe occur?
A) 39.9° B) 18.7° C) 11.4° D) 12.2° E) 9.35°
B
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Rocks that formed from the cooling of molten material are classified as
a. discordant. b. metamorphic. c. sedimentary. d. igneous.
The most likely method of interstellar communication is similar to which type of communication on Earth?
A) sign language B) telepathy C) Morse code D) the spoken word
Vesta's density is:
A) about the same as other asteroids, around 2100-2900 kg/m3. B) lower than typical asteroids, around 1400 kg/m3. C) about the same as a typical comet, around 100 kg/m3. D) about the same as the densest meteorites, around 5000 kg/m3. E) more than the density of other asteroids, but less than the density of a terrestrial planet; around 3500 kg/m3.
The strange object ________ is believed to be the black hole in the center of our Galaxy
Fill in the blank(s) with correct word