The book Physics for College Students was written by author Henry S Henry Smith Carhart Here you can read free online of Physics for College Students book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Physics for College Students a good or bad book?
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28 x 10~~ 12 calories. When T T 2 is only a few degrees, Stefan's law is equiv- alent to Newton's law of cooling. 429. The Radiometer. Among the instruments which have been used to measure the intensity of radiation is a modifi- cation of Crookes's radiometer due to Professor E. F. Nichols. Sir William Crookes invented the radiometer in 1873 while investigating the properties of highly attenuated gases. It consists of a glass bulb exhausted to a pressure not exceed- ing 7 mm. Of mercury (Fig. 2...73). Within the bulb is a light cross of aluminum wire carrying small vanes of mica, one face of each being coated with lampblack ; the whole is mounted so as to revolve lightly on a ^M vertical pivot. When the radiometer is placed in sunlight, or receives the radiation from a hot body, the cross revolves with the blackened faces of the vanes retreating from the source of radiation. The explanation of this interesting instrument is found in the kinetic theory of gases that the mean free path of the molecules between col- lisions with other molecules, at this low pressure, becomes equal to the distance between the vanes and the wall of the bulb.
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