Question

Why is a loud sound heard at acoustic resonance?

Answer 1

this is because the natural frequency of the body becomes equal to the amplifier frequency the result the higher altitude of consequence louder sound

Answer 2

Here is your answer mate ↙️↙️✌️✌️✌️

This is because the natural frequency of the
body becomes equal to the applied
frequency.
This results in higher amplitude and consequently louder sound.

Hope this helps you mate ☺️☺️✌️✌️✌️