Who is the father of modern physics

Galileo Galilei

Explanation:

Galileo Galilei pioneered the experimental scientific method, and was the first to use a refracting telescope to make important astronomical discoveries. He is often referred to as the "father of modern astronomy" and the "father of modern physics". Albert Einstein called Galileo the "father of modern science."

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the principle of popular sovereignty is most closely related to the concept of

democracy