Lessons in Elementary Physics
Lessons in Elementary Physics
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In our eReader you can find the full English version of the book. Read Lessons in Elementary Physics Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Lessons in Elementary Physics
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Finally we may state that : All coloured substances are substances which behave in a partial manner with respect to the visible rays, and if we had no such partial absorption we should be deprived of one great source of beauty in nature.
Coloured glasses aiford a very familiar illustration of this selective or partial absorption. A green glass absorbs all, or nearly all, the red rays which fall upon it, allowing the green to pass ; on the other hand, a red glass absorbs nearly all the green, an...d allows the red to pass. Thus we see that surfaces or plates which behave in one way with respect to dark rays, may behave differently with regard to luminous ones ; nay, further, a substance that behaves in one way with regard to a Y 322 ELEMENTARY PHYSICS chap, vii luminous ray of one colour, may behave in a different way with regard to a luminous ray of another colour. We have stated generally that good radiators are good absorbents ; but in view of the fact that bodies select or choose the rays which they absorb, this statement must be extended, and we now assert that bodies when cold absorb the same kind of rays that they give out when heated.
What to read after Lessons in Elementary Physics?
You can find similar books in the "Read Also" column, or choose other free books by Balfour Stewart to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Finally we may state that : All coloured substances are substances which behave in a partial manner with respect to the visible rays, and if we had no such partial absorption we should be deprived of one great source of beauty in nature.
Coloured glasses aiford a very familiar illustration of this selective or partial absorption. A green glass absorbs all, or nearly all, the red rays which fall upon it, allowing the green to pass ; on the other hand, a red glass absorbs nearly all the green, an...d allows the red to pass. Thus we see that surfaces or plates which behave in one way with respect to dark rays, may behave differently with regard to luminous ones ; nay, further, a substance that behaves in one way with regard to a Y 322 ELEMENTARY PHYSICS chap, vii luminous ray of one colour, may behave in a different way with regard to a luminous ray of another colour. We have stated generally that good radiators are good absorbents ; but in view of the fact that bodies select or choose the rays which they absorb, this statement must be extended, and we now assert that bodies when cold absorb the same kind of rays that they give out when heated.
What to read after Lessons in Elementary Physics?
You can find similar books in the "Read Also" column, or choose other free books by Balfour Stewart to read onlineMoreLess
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