Which of these are NOT associated with the active Sun?
A) aurora B) granulation C) sunspots D) flares E) prominences
B
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Which of the following is not true of the fossil record?
A) The fossil record spans 3 billion years of Earth's 4.6 billion year age. B) The most common fossils are from organisms that had hard parts like shells and bones. C) Similar to present day stromatolites, the first fossils were simple, anaerobic algal plants. D) The Paleozoic era is credited with the emergence of life.
The field outside a solenoid behaves like that of a bar magnet
Indicate whether the statement is true or false
The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1eV = 1.60 × 10-19 J)
(a) What is the average lifetime of this state, in femtoseconds? (b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?
Kepler’s second law implies that as a planet’s distance from the sun increases in an elliptical orbit, its orbital speed
A. Increases. B. Decreases. C. Remains the same. D. Changes in a way we cannot determine.