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42 bytes added ,  06:04, 22 July 2014
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===Notes for teachers===
 
===Notes for teachers===
 
===Activities===
 
===Activities===
#Activity 1 - Sound propagation using PhET
+
#Activity 1 - [[Sound_propagation_of_sound_activity_1|Sound propagation using PhET]]
    
==Concept #4 - When sound propagates==
 
==Concept #4 - When sound propagates==

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