小学自然第十册第16课《声音的产生》实验中,课本中这样要求:“用槌敲音叉,听到声音后,把音叉放在吊着的塑料小球旁,你看到什么现象?再次敲响音叉,把音叉放在水中,又看到什么现象?这说明什么?” 我按课本中的要求进行实验。敲响的音叉接触吊着的塑料小球,塑料小球只是微微地动了一下。效果不明 In the textbook, “Lesson 16,” “The Generation of Sound,” in Primary School Vol. 16, requires: “After you hammer the fork and hear the sound, place the tuning fork next to the hanging plastic ball. What do you see? Again sounded the tuning fork, put the tuning fork in the water, and see what phenomenon? What does this mean? ”I press the text of the requirements of the experiment. The sounded tuning fork touches the suspended plastic pellet, the plastic pellet just moving slightly. The effect is unknown