Respuesta :
The frequency at which the body vibrates breaks is natural frequency. The glass with her voice because the frequency of her voice matches the natural frequency of the glass.
What is the natural frequency?
When there is no external force acting on the body unless the body vibrates is known as the natural frequency of vibration.it is denoted by [tex]\rm w_n[/tex].
when the frequency of a body matches the natural frequency a condition occurs known as resonance.
To learn more about the natural frequency refer to the link;
https://brainly.com/question/1123932