In music, meter refers to the recurring pattern of strong and weak beats. Simple meter is a type of meter in which each measure (or bar) consists of two or three beats. In duple meter, there are two beats per measure. The strong beat is on the first beat of each measure, and the weak beat is on the second beat.
Amazing Grace is written in duple meter, with a strong beat on the first beat of each measure and a weak beat on the second beat. This can be seen in the way the melody is structured, with phrases of two beats alternating with phrases of one beat.
Here is an example of the rhythmic pattern of Amazing Grace in duple meter:
```
Strong beat | Weak beat | Strong beat | Weak beat
1 2 1 2
A-mazing grace, how sweet the sound
```