The results, as shown in the table below, are rounded off to 3 significant figures for easy references. As you can see, for 500 hz, we had three attempts  0.660, 0.690 and 0.694. After gaining the average which is 0.681, we calculated the speed of sound using the formula in Table 1 and got our results. It is indeed close to 340 m/s. Seeing that the results are accurate, we decided to carry on to the 1000 hz. We also got three results for 1000 hz 0.336, 0.340 and 0.344, having an average of 0.340. For 1000 hz, the speed of sound calculated using Table 1 is accurate as it is 340 m/s and therefore we moved on to 2000 hz. The three results are 0.180, 0.160 and 0.170 and using the same formula, the speed of sound is 340 m/s.
Key findings
The key findings through this experiment is that the speed of sound is 340 m/s and that doing each frequency thrice would make the experiment even more accurate.
Explanation of key findings
We found out that carrying the experiment out for each frequency out thrice will make the results more accurate as when we were playing 500 hz of wavelength through the phone, we tried to use the first result but it wasn’t that accurate. Therefore, we did it a second time and it became more accurate by taking the average of the two. Then, we took the frequency the third time and realised it was 340 m/s.
Evaluation of Hypothesis
After doing the experiment, we found out that our hypothesis was correct, stating that the speed of sound is 340 m/s. Our hypothesis is correct and therefore, the speed of sound is 340 m/s.
Areas for improvement
Limitations

Areas of improvement

Reasons
 
In the area of procedures

Finding a secluded corner to conduct the experiment

We should find a quiet place to conduct our experiment.

It is to avoid other sounds to affect the experiment.

In the area of experiment

We are limited to the range of frequencies that we can use for the experiment.

We could reduce the range of sound frequency.

we are not able to hear frequencies that are too high or too low.

In the area of materials.

We are limited to use frequencies that are too low as we need to find the distance between the sound waves.

We could extend the plastic tube.

When the plastic tube is extended, we are able to find the distance between the soundwaves.

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