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Determining oxides in reaction of Cu and nitric acid

Recently, my teacher taught me the reaction between $\ce{Cu}$ and $\ce{HNO3}$. But I don’t understand one thing. What determines what type of oxide will be formed in the reaction? For example, if I react copper with dilute nitric acid, $\ce{N2O}$ is formed, whereas in case of medium and concentrated nitric acid, $\ce{NO}$ and $\ce{NO2}$ is formed respectively. Why does it happen like this? What determines the oxides in the fundamental level?

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