A Kundt's tube experiment is conducted with a ` 1m` long glass rod , twice , one with air and the other with hydrogen , gas filled in the tube . In the first case , there were `11` heaps of lycopodium powder within a length of `64.4 cm` between the first and the last . The corresponding parameters in the second case are ` 5` nodal heaps within ` 99.7 cm` length.
Find the velocity of sound in glass and in hydrogen m if that in air be `335 m//s`.

Explanation

To solve the problem, we need to find the velocity of sound in glass and in hydrogen based on the given information from the Kundt's tube experiment.

### Step-by-step Solution:

1. **Understanding the Setup**:
- The Kundt's tube experiment is conducted twice: once with air and once with hydrogen.
- In the first case (with air), there are 11 heaps of lycopodium powder in a length of 64.4 cm.
- In the second case (with hydrogen), there are 5 heaps in a length of 99.7 cm.
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