The observed amount of difference between the perihelion of Earth in early January and aphelion in early July results in the northern hemisphere being _____
a. cold in January and hot in July
b. hot in January and cold in July
c. equally cold in both January and July
d. equally hot in bot January and July
e. Wrong! The seasonal differences in northern hemisphere temperatures is not caused by differences in distance from the Sun.
e
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Which factor below determines the steepness of a volcano?
A) how easily the lava flows B) the temperature of the lava C) the duration of the eruption D) the age of the volcano E) the volume of lava
Rotation curves for spiral galaxies show
A) they are slowing down. B) most have dark halos. C) rotation speed drops off further from the nucleus. D) most of the mass lies in the nucleus. E) no relation to mass.
Water can change phase to become ice by
A) extraction of energy. B) lowering the surrounding air pressure. C) both of these D) neither of these
A diatomic molecule has 2.6 × 10-5 eV of rotational energy in the L = 2 quantum state
What is its rotational energy in the L = 1 quantum state? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 3.4 × 10-6 eV B) 7.8 × 10-6 eV C) 5.3 × 10-6 eV D) 8.7 × 10-6 eV