Question

Which phenomenon occurs when an object absorbs wave energy that matches the object's natural frequency?

Answer 1

When object absorbs energy then due to this energy it will have increase in it natural frequency

This increase in natural frequency will lead it to the increase in the amplitude of the object

Now when natural frequency of the object will match with the frequency of the wave that is absorbed by the object then this phenomenon is known as Resonance.

In resonance the amplitude of object will rise high and it will reach to its maximum limit.

so at condition

$f_n = f_{wave}$

then in this condition it is known as resonance

Answer 2

The answer to the question above is resonance. This is a phenomenon in which the absorbed waves match the frequency the object's natural frequency which is also sometimes referred to as resonant frequency. This would cause an increase in amplitude of oscillation or vibration of the system.