Why did the Big Bang not produce a significant proportion of elements heavier than helium?
A) High-energy photons did not affect helium, but blasted apart the nuclei of heavier elements as soon as they formed.
B) By the time helium nuclei could survive, the temperature had become too low for heavier elements to form.
C) They did, but radioactive decay caused these elements to disappear again.
B) By the time helium nuclei could survive, the temperature had become too low for heavier elements to form.
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Which of the following has the highest specific heat?
a. ice b. water c. steam d. They are all water, so they all have the same specific heat.
In each element of a series LRC circuit
A) the currents are not in phase. B) the currents and voltages are not in phase. C) the voltages are in phase. D) the currents are in phase. E) the currents and voltages are in phase.
Which of the following is the most reasonable estimate of the number of characters (typed letters or numbers) in a 609-page book? Assume an average of 194 words per page and a reasonable average number of letters per word
A) 5 × 105 char B) 5 × 107 char C) 5 × 106 char D) 5 × 104 char