I have created a reaction time measurement java applet 10 years ago with JDK1.0.2.

This is the EJS version of the same applet. You can see how it was created with ejs (and all the model) if you click the link below the applet(Loas it as signed applet).

Click after the simulation is paused.

<hr>Enjoy the fun of Physics! You can access this simulation online from <br><a href='http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=387.msg1181#msg#message_id' target='ntnujava'>Reaction time measurement</a> <br>Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/) <br>Deptartment of Physics, National Taiwan Normal University, Taiwan </body> </html>