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  1. ...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...

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

  3. ...virtually all matters easily. So just a piece of paper will never shield well . Shielding for gamma rays requires large amounts of...

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

  6. 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...

  7. 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...

  8. 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.

  9. ... 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 ...

  10. ... no relation between heat capacity (referred to as HC below) and bp as well as mp. Say for example, water has very high specific HC (...