Which of the following isotopes is not commonly used for dating objects? a. carbon-14 b. phosphorus-32 c. potassium-40 d. rubidium-87

The correct answer is phosphorus-32-32.

Explanation:

Phosphorus-32 is an isotope of phosphorus found in many organic molecules. They are used to detect metabolic pathways of involving bio-molecules. Also used to detect malignant tumors in the body of the living being.

Where as:

Carbon-14 is used for carbon-14 dating also known as radiocarbon dating. this is used to determine age of  old objects.

Potassium-40 id used to determination of age of rocks and minerals. Specially used in potassium argon dating.

Rubidium-87 is an isotope of rubidium element used to  determine age of rocks.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >