Find the following :
The time period of a wave if the time interval between 1st crest and 9th crest is 48 s

Explanation

To find the time period of a wave given that the time interval between the 1st crest and the 9th crest is 48 seconds, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Number of Crests**:
- We have the 1st crest and the 9th crest. The total number of crests is 9.

2. **Determine the Number of Wavelengths Covered**:
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