In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life
B) all four DNA bases used in life
C) complex carbohydrates
D) simple proteins
B
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The outward pressure in the core of a red giant balances the inward pull of gravity when
A) hydrogen begins fusing into helium. B) carbon fuses into heavier elements. C) the electron orbits are compressed so much they are all in contact. D) the electrons and protons have combined to form neutrons. E) iron forms in the inner core.
When an RLC series circuit is in resonance, its impedance is:
a. zero. b. equal to its resistance. c. a maximum. d. ?/2 ?.
Order the interior layers of the Sun from hottest to coldest.
A) radiation zone, core, convection zone, photosphere B) core, radiation zone, convection zone, photosphere C) photosphere, convection zone, radiation zone, core D) photosphere, convection zone, core, radiation zone
The two concepts that led Niels Bohr to refine the planetary model of the atom are
A. discovery of the nucleus and quantization of energy. B. properties of electrons and the hydrogen spectrum. C. discovery of the nucleus and properties of electrons.