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In the chapter sound, my book states that the Frequency of damped vibrations is less than the natural frequency but I could not understand this because in damped vibrations the amplitude decreases and not the frequency. May someone please explain this statement to me. I have googled this out but nowhere found the answer to my question rather there were confusing terms like damping coefficients etc. . My book also does not answer the "why" of my question.
P.S. I am a tenth grader so please avoid complicated terminologies.