The Babcock model explains:
A) the changes in the wavelengths of radiation.
B) the process behind quantum jumps.
C) how the Coulomb force helps in binding electrons to an atom.
D) the reversal of the Sun's magnetic field from cycle to cycle.
D
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Facts in the field of science
A) are absolute. B) are changeable. C) mean very little. D) are more important than theories.
What element is oxidized in the following equation and what element is reduced?
SN2 + 2 Ag ? Sn + 2 Ag? A) The tin ion, SN2 , is oxidized, while the silver, Ag, is reduced. B) The tin ion, SN2 , is reduced, while the silver, Ag, is oxidized. C) Both the tin ion, SN2 , and the silver, Ag, are reduced. D) Both the tin ion, SN2 , and the silver, Ag, are oxidized.
Steel blocks A and B, which have equal masses, are at TA = 300 °C and TB = 400 °C. Block C, with mC = 2mA, is at TC = 350 °C. Blocks A and B are placed in contact, isolated, and allowed to come into equilibrium. Then they are placed in contact with block C. At that instant,
a. TA = TB < TC. b. TA = TB = TC. c. TA = TB > TC. d. TA + TB = TC. e. TA - TB = TC.
A loop of gas following the magnetic field lines between sunspots' poles is:
A) a flare. B) a ray. C) a coronal hole. D) a prominence. E) a coronal mass ejection.