What is the Nyquist rate? What happens when a signal is sampled at less than the Nyquist rate?

What is the Nyquist rate? What happens when a signal is sampled at less than the Nyquist rate?

What is the Nyquist rate? What happens when a signal is sampled at less than the Nyquist rate?
What is the Nyquist rate? What happens when a signal is sampled at less than the Nyquist rate?

 

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