Fizziq//A sound stopwatch//For a swimming race, the organizers want the stopwatch to start as soon as the sound signal is heard by the swimmers. Can you create one?//The triggers allow you to program the start and end of a recording, or to start a stopwatch according to the level of a measure//Which measuring tool should you use to start the stopwatch? What threshold value should you use to trigger the stopwatch?//From the Tools menu, select the triggers. How do you program them so that a stopwatch starts when the sound signal exceeds the threshold you set?//Once you have programmed the trigger, go to the Measurements tab and press the REC button. You will see the sign of a lightning appear. Clap your hands, wait a bit, then stop the stopwatch. The value of the elapsed time is recorded in your notebook//What is the point of a sound stopwatch?//Using the triggers, could you program a stopwatch that will start when you clap your hands and stop when you clap your hands again?