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Activity

Hearing through our bones

Summary: 
Hear sounds through your jaw bones, like a snake.
Science content (2016 curriculum): 
Biology: Features, Adaptations of Living Things (K, 1, 3, 7)
Biology: Sensing, Organ Systems (4, 5, 6)
Biology: Evolution, Natural Selection (7)
Materials: 
  • tuning fork
Procedure: 

Roll up your sleeves to expose the tip of your elbow.
Put one pointer finger in tour ear.
With your other hand, pick up the tuning fork by the handle end.
Hit the branched end of the tuning fork hard on your knee or a surface that will not get damaged.
Press the ball of the tuning fork against your elbow bone.
Can you hear the note from the tuning fork? If you can't, try hitting the tuning fork harder and pressing your finger more firmly into your ear.

The sound vibrations from the tuning fork travel up your arm bone and directly to your inner ear. We usually hear sounds through the air, which are received by our outer ear (our ear flaps) before being transferred to our inner ear.

Snakes do not have outer ears. Sound vibrations from the ground vibrate their jaw bones, which transmit the sound vibrations to their inner ear directly (as in this activity).
They are very sensitive to sounds made by small prey running nearby.

Grades taught: 
Gr K
Gr 1
Gr 2
Gr 3
Gr 4
Gr 5
Gr 6
Gr 7
Teacher: 
Self guided
Teaching site: 
Science World
Activity originally developed and delivered: 

Science World