Melinda was cooking a pizza and removed the pizza from the oven, which was set to 204 degrees Celsius. She wanted to cool down the pizza as quickly as possible to eat it. In her house, she had a freezer (set to -18 degrees Celsius), a refrigerator (set to 4 degrees Celsius), and the countertop (which is at the temperature of the room, 25 degrees Celsius).
Design an experiment that will let Melinda study which of the three options, the refrigerator, the freezer, or the room, will let the pizza cool down the fastest. In your experiment design, be sure to describe: The independent variable, the dependent variable, the controlled variables and your procedure.

Independent variables are the devices.

Dependent variable is the rate of cooling.

There is no controlled variable.

Explanation:

Independent variable is required to be changed to observe its impact on the dependent variable. The controlled variable is kept as a standard for experimentation process.

Independent variable are the temperatures of different devices which were used to cool down the pizza.

Dependent variable is the rate of cooling of the pizza.

Controlled variables: No control variables are set in this experiment.

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radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.