As we described earlier, this changing electrical impulse or changing voltage is going into our speaker and causing a vibration in this speaker which is equal to the vibrations from the music at the source. Each group will make the transmitter part of the modulated laser and test it on teachers equipment. Have a contest on who can hear the signal from the furthest away. Students will use the modulated laser they built as a guide and illustrate the circuit involved in making this work. They will then describe in detail how the modulated laser works.
Circuit is illustrated completely and accurately.
The explanation is clear enough for anyone to follow the instructions and build a modulated laser. Have various tapes from different cultural backgrounds to play for the students. Also ask the students how this lesson can apply to our lives and our future.