Can Sound Travel through a Barrier? (page 2)
Show Your Results
For "Go Easy," make a bar graph showing the distances (on the vertical axis) for each of your listeners (on the horizontal axis). Use a color code to dentify each listener. Write a few sentences to explain how the barrier (without and with the hole) affected listening distance.
For "Go," average the performance of all your listeners at each distance. Make a bar graph of averages. Write an explanation for the distance and barrier effects.
For "Go Far," make separate data tables for sounds of different frequencies and amplitudes. Make bar graphs to compare different kinds of barriers or different sizes, shapes, or configurations of holes.
Put measurements in a data table like this for "Go" and "Go Easy":
|Listener||Farthest Distance Bell Heard (cm)|
|No Barrier (Black)||Solid Barrier (Blue)||Hole in Barrier (Red)|
|3 . . . and so on|
|Average (for "Go")|
Tips and Tricks
The jingle bell is recommended because it makes a soft sound that cannot be heard across too great a distance. If singing birds or distant traffic noises make hearing the bell difficult, try shaking a metal tack inside an aluminum soft drink can.
Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state’s handbook of Science Safety.