There are samples of two different isotopes, X and Y. Both contain the same number of radioactive atoms. Sample X has a half-life half that of Y. How do their decay rates compare?
a. The rates of X and Y are equal.
b. X has a greater rate than Y.
c. The rate depends on atomic number, not half-life.
d. X has a smaller rate than Y.
B
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Which of the choices below correctly lists things in order from largest to smallest?
A) Sun, Earth, Solar System, Milky Way, Universe B) Universe, Milky Way, Sun, Earth, Solar System C) Solar System, Earth, Sun, Universe, Milky Way D) Universe, Milky Way, Solar System, Sun, Earth E) Milky Way, Universe, Solar System, Sun, Earth
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What will be an ideal response?