9. If subjected to sound frequencies of
25,000 to 100,000 cycles per second,
which of the following would be least
affected?
(1) a porpoise
(2) a house cat
(3) a cheetah
(4) a bat
(5) a human being
Solved
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Ответ:
The correct answer is option C.
Explanation:
The radioisotopes in the Earth's interior are not in pure form and exhibit various entrenched impurities and are interspersed. Thus, when a neutron is discharged by a decaying atom, its occurrences of hitting another atom of radioisotope in order to continue the chain reaction becomes lower in comparison to the man-made nuclear reactor. In this manner, the radioactive chain reaction in the interior of the Earth is not well-sustained.