Question

What is resonance and what is natural frequency; is it the same as fundamental frequency ?

Answer 1

RESONANCE -
resonance is a property by which the frequency of the applied force matches with the natural frequency of an object which results in the body to oscillate with an increased amplitude...

Explanation:

NATURAL FREQUENCY-
the frequency possessed by the body without any external force acting on it...

natural frequency is not same as fundamental frequency
natural frequency is concerned with oscillations whereas fundamental frequency is concerned with waves..