Paper cup telephone (continued) - B

Two of you can hold the cups with the string stretched taut. Speak into the cup. Now ask a member of your group to hold the string firmly somewhere in the middle.

Ask another member to touch the string gently first at the speaking end and then at the hearing end.
 

                   
                                         Image 3.1 (b): Hold the string firmly     

Note that one person should be speaking into the cup while another person holds the string.                                                                                                                                                                                           
                                                                                                                                        

Please keep changing the roles within the group so that evrey member of the group gets the chance to explore.                                                                                                                            

What did you feel when you touched at the speaking side and when you touched at the listening side?
Can you explian why?

                                       
                                 Image 3.1 (c):  Touch gently from speaker's end   
    

Bring your ear near to the string (while someone is speaking into the cup)

Do you hear anything?
How does the string help to make the sound audible?