Students become involved in learning through involvement in the study of how sound travels. Divide the class into working groups assigning each group a different task. Provide large chart paper, markers, possibly old magazines and scissors, etc. This could be done by more than one group using differing comparatives. When groups share and display their work, other class members can be encouraged to add to the lists.
Students become involved in learning through working together.
Have students experiment with megaphones by rolling paper. Speak to a partner in a whisper with and without a megaphone. You may want to work on the playground for this. Use different voice levels. Outside, experiment with sound.