Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the longest wavelength?
A.
B.
C.
D.
E.
Answer: D
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A waxing crescent moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. near the western horizon just before sunrise. d. near the western horizon just after sunset. e. from sunset until sunrise.
How do scientists determine how long ago Earth first formed?
A) radiometric dating of meteorites B) radiometric dating of Moon rocks C) radiometric dating of the oldest Earth rocks D) Models of planetary formation tell us how long it took Earth to grow to its present size.
Which of these is the likely progenitor of a type I supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses B) a contact binary, with the neutron star at 2.3 solar masses C) an evolved red giant which is just starting to make silicon in its core D) an evolved blue supergiant that is about to experience the helium flash E) a helium-neon white dwarf
Use the conservation laws to identify the missing particle in each of the following reactions. (a) ?? + p —> ?+ + __________. (b) ?+ —> ?? + _________. (c) p + p —> p + ?+ + ___________
Fill in the blank(s) with correct word