Anyone please explain me what these lines mean out of this classroom experiment.

>Experiment #5: -- “Hangers and Spoons” – Sound Waves Traveling Through A Medium (Hangers and spoons with a strings attached. Note: For younger students, attaching dixie cups to the end of the strings can be beneficial if they have difficulties wrapping the string around their fingers.) In this experiment, have the students take either a hanger or spoon and then wrap the end of the strings around each of their index fingers 3 times. ***After they have completed this task, have the students carefully swing their spoon or hanger so that it lightly taps against a table or wall. Ask the students, What Do You Hear? They should hear a light clanging sound. Now, have students carefully place their index fingers or dixie cups in the front of the opening of their ear canal. Once they have done this, have the students lean over and swing the hanger or the spoon again so that it taps against the table or wall.*** Have the students observe what happens and then repeat the question, What Do You Hear? The spoon should sound like a bell and the hanger sounds like a gong. Ask the students, Why Does Banging The Hanger Or Spoon Against The Table Or Wall Sound Different When You Put The String Up To Your Ears? Note: Ensure that students have an opportunity to try both the hanger and spoon before you proceed to the next experiment. Inform the students that the sound waves travel up the yarn to our ear instead of spreading out in all directions into the air around us. The string transmits the sound directly to our ears making the sound louder and more distinct. The yarn acts as a conductor of sound energy. The string is the medium through which the sound waves