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有個男仔站在距離一座山300m的地方,佢利用2支木棒敲打 每當佢聽到回音時,佢就會敲打多一次 佢用左53s 黎敲打 第1次 至 到第31次! 請問聲音的速度是多少???? 敲打次數(唔計第一次)=30次 平均每次既time taken=53/30=1.77s 來回既distance traveled = 300x2=600m by v=s/t , v...
what is the advantage of short wave length of ultrasonic wave? It can have large degree of diffraction. °o...
..., their single ear in their abdomen has the ability to hear ultrasonic sounds (Yager and May). This ultrasonic hearing...
Why Not?? 超聲波(ultrasound/ ultrasonic )是音波(sound wave)的一種, 音波只要在有粒子(particles)的介質(medium)裡便可傳遞, 只有在真空(vacuum)的情況下才不能傳遞. 故此, 超聲波能pass through a transparent plastic plate!!
宮外孕:Extra-uterine pregnancy 照陰道超聲波:According to vagina ultrasonic wave 包皮:Wrapper 黃疸病:Yellows 會陰切開:Perineum...
分類:懷孕及教養孩子 > 其他 - 懷孕及教養孩子 2009年06月18日
... gramma ray can penetrate almost all metal plate and detect these flaws. ( Ultrasonics , of frequency higher than audiable one, can also detect these flaws by reflection...
...:此設置開啟時即變為有聲警報(此設置推薦用於測試時使用) ULTRASONIC :設定此設置,則只有你的狗狗會感覺到止吠器在運行;觸發時將產生小聲蜂...
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