Waves on String

Say you have built a tin can phone out of two tin cans held together with a string. When the string is stretched tight the sound talked into one can be heard in the other can. Which of the following are things you would do to speed up the transmission between the two cans?

  1. Pull the string tighter
  2. Loosen the string
  3. Use wire instead of string to join the cans

Answer.