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  1. ... you do the exercise of the Ch. you should know the concept very well . This is the very important concept that you should know in the ...

  2. .... Both methods of rubbish treatment should not be the mainstream, the best method starts from classification of rubbish and advocate the four slogans...

  3. Yes, oxygen can become solid. All elements have three states, solid, liquid and gas. If the element is below its melting point, it will become solid. So if oxygen is below its melting point, it will become solid.

  4. ...they have good customer service. Also, their prices are better than other labs. You can contact them, please see below: Prime Testing Group Ltd. Contact...

  5. 找些科學雜誌的網頁,報紙的網頁eg : scmp,yahoo,goodies,internegtional and stuff like that

  6. With reference to the diagram below: 圖片參考:http://i117.photobucket.com/albums/o61/billy_hywung/April07/Mirage.jpg Cold air is denser than warm air, and has therefore a greater refractive index. As light passes from...

  7. ...very short distance in dense media. So with a piece of paper (cardboard be better ) with enough density, alpha particles can be shielded and absorbed...

  8. 1 是錯的。因為內能和物體的大小有關。而熱則會由高溫物體流向低溫物體。所以當您倒一杯100度的水入湖中﹐整個湖的內能固然高過100度的水﹐但熱會由100度的水流向湖水。 2 是錯的。熱空氣上升是因為其分子運動較快﹐體積增大導致密度下降。 3 是對的。內能是分子動能和分子間勢能...

  9. 1. Since the ratio of the height of image to the height of object for a given object distance from the lens is a constant (this is the magnification), you could use an arbitrary height for the object/image. Since the image is formed by a convex lens at the same side as the object, it must be...

  10. A ticker tape timer is a device that works by making marks on ticker tape with inked carbon paper or an electrical spark as the paper is pulled through the ticker tape timer. The timer makes these marks at regular intervals...