How data were collected?

In order to obtain desired quantities, we made some measurements and collected data, including the diameter of the laser beam, the resistance of the laser pointer, and the sound pressure vs. time graph. 

First, we measured the diameter of the laser pointer. When the data was collected, the laser was put closely in front of the solar panel. Hence, we do not need to take account of the increase in diameter of the laser beam in accord with the distance. We also calculated the resistance of the laser pointer. Since the laser pointer was a diode, the resistance of the laser pointer changed with the supplied voltage. Hence, we built a simple circuit as shown below. We gave a 3V power supply and record the voltage across the resistor and the current in the circuit. We computed the voltage drop across the laser pointer, and we used this dropped voltage and the current to compute the resistance of the laser pointer at 3.06V particularly.

As for the sound waves, we gave a sound signal with a certain current to the microphone and collect the sound pressure vs. time using Loggerpro. We repeated this with 7 different currents, a total of 8 trials. The following graph is one of the sound waves that was constructed using Loggerpro.

The sound pressure 1 corresponded to the direct sound signal of my voice and the 2 corresponded to the sound wave from the output, the speaker.