An isotope undergoes radioactive decay. the new isotope that forms has an atomic number that is 2 less than the original isotope's. what kind of decay has occurred, and how do you know?

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

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Light waves travel than sound waves.