To measure how fast sound travels in different materials, there are several fun ways to do experiments. Each method is designed for a specific kind of material. Here are some common techniques:

1. Time of Flight Method
In this method, you start by making a sound with a speaker and then listen for it with a microphone placed a certain distance away. To find out how fast the sound is moving, you can use this formula:
$v = \frac{d}{t}$
In this formula, $v$ is the speed of sound, $d$ is how far the sound traveled, and $t$ is how long it took for the sound to get there.

2. Resonance Method
This method uses a tuning fork, which is a tool that makes a specific sound when you hit it. You place it near a tube filled with air. By changing the length of the air in the tube and listening to the sound, you can measure how fast sound travels in the air. You can use this formula:
$v = f \lambda$
Here, $f$ is the sound frequency from the tuning fork and $\lambda$ (lambda) is the wavelength, which is based on how long the tube is.

3. Doppler Effect
In this method, you listen to a sound as it moves towards or away from you, like a passing car. By measuring how the sound changes, you can figure out how fast it’s going. This involves understanding the speeds of both the moving sound source and the person listening.

4. Interferometry
This technique uses special tools called interferometers. They help you see patterns when two sound waves meet. This method is very useful for measuring sound in solids and liquids.

In short, these methods help us find out how fast sound travels in different materials. They give us important information about sound waves and how they interact with things around them. Each technique is unique and fits the specific type of material being studied.