Paper cup telephone (continued) - B

Now ask a member of your group to hold the thread firmly somewhere in the middle.



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

                                                                                                                                                                                                                                                  Image 3.2 (a): Hold the string firmly
                                       
 Image 3.2 (b):  Touch gently from speaker's end           Image 3.2 (c): Touch gently from listener's end  


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

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 touch at the speaking side and when you touch at the listening side?
Can you explian why?

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?