What is the sound of that the father hears?

The following dialogue is for questions 14 to 20.

Father: What is that sound? Gaduh, what happened?

Gaduh: I'm sorry, Dad. I broke the window.

Father: It's okay. Are you alright?

Gaduh: I'm fine.

Father: That's a relief. How did you break the window?

Gaduh: I kicked the ball too hard and high?

Father: Alright. Now get a broom and dustbin.

Gaduh: OK, dad.

Father: And collect all the broken glass.

Gaduh: I understand, Dad.

What is the sound of that the father hears?