C. They have no electrical charge/NEUTral
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B.)<span>A doctor would use technetium-99m because a short half-life indicates a quick measurement, and a geologist would use rubidium-87 because a longer half-life means that there is a longer time to measure old rock. </span>
Gas is a substance that will not phase change.
And vapor is a substance above it's boiling point temperature.
The answer is A)radio waves, micro waves, visible light, x-rays
Answer:
Substance A is a base and Substance B is an acid.
According to the experimental results
