Math riddle i think the answer is one but am not sure?

ou have ten stacks of 10 half dollar coins. one entire stack is counterfeit but you do not know which one. you do know the weight of a genuine half dollar and you also know that the counterfeit coins are each one gram more than they should be. you may weigh the coins on a deli type scale. what is the smallest number of weighings necessary to determine which stack is counterfeit? Explain your answer.

I think the answer is one but i am not usre

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