For a selected atom in a sample of a radioactively decaying isotope, the probability that it will decay during a time interval of a specified length is
A. dependent on how long ago t=0 was set.
B. independent of when the time interval starts relative to the current time.
C. dependent upon how old the atom is.
D. fundamentally unpredictable.
B. independent of when the time interval starts relative to the current time.
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Which of the following is NOT a kind of geological feature found on the Moon?
A. rille B. scarp C. crater D. maria
Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
Suppose the amount of fish caught worldwide, assumed to be a small proportion of the total fish population, grows at an annual rate of 3%. About how long will it take for the fish catch to double?
a. 10 yr b. 13 yr c. 18 yr d. 23 yr e. 33 yr
An electron (m = 9.1 × 10^?31 kg) has a speed of 0.90c. What is the difference between its relativistic momentum and its non-relativistic momentum (in kg m/s)?
a. 4.3 × 10^?22 b. 3.2 × 10^?22 c. 5.4 × 10^?22 d. 6.5 × 10^?22 e. 2.5 × 10^?22