Correct

啪嗒

/ pā tà / 
Strokes

Example

As an Onomatope

patter

1
Yǔdiǎn
雨点
pātà
啪嗒
pātà
啪嗒
dá
打
zài
在
chuāngzi
窗子
shàng
上
  
。

Raindrops were pattering against the window.

2
Xiǎogūniáng
小姑娘
yǎnlèi
眼泪
pātà
啪嗒
pātà
啪嗒
wǎng
往
xià
下
liú
流
  
。

The tears trickled down the cheeks of the little girl.