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在0.02秒內，敲擊音叉在空氣中產生聲波，經示波器顯示如圖甲、乙波形，下列敘述何者正確？
打擊樂器中的定音鼓下方有一個踏板，可以調整鼓面的鬆緊程度。踏板的作用是在改變定音鼓的哪一項性質？
如圖所示，一波動之頻率為5Hz，波峰到波谷的水平距離為4公分，波峰到波谷的垂直距離為6公分。則該波每做一次完整的振動，波上的介質分子X點，總共行進的距離為多少公分？
某繩波波形如圖所示，波向右進行，波長為10公分，波速為50公分／秒，試回答下列問題：
法拉第做音叉實驗，如附圖，甲、乙、丙、丁為同一時間內傳播的四種波形，試回答下列問題：
以三種樂器同地同時在相同介質中發出三種聲音，聲音的頻率和分貝數如表所示，試回答下列問題：
如圖(一)所示，一條長彈簧上產生連續的週期波，經過0.01秒後「波形」上的A點向右移動了2格，形成圖(二)的波形，試回答下列問題：
附圖為連續週期波。若波源做1次完整振動花了5秒，且甲、丙是波峰，乙、丁是波谷，且a、b間的距離是150公分，試回答下列問題：
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