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" This experiment shows that the intensity of illumination varies inversely as the square of the distance from the source of light. "
Physics - Page 178
by Henry Smith Carhart - 1917 - 478 pages
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Physical Review, Volume 16

Physics - 1903 - 422 pages
...ROOM. Bv KJ ROGERS. AN experiment suitable for junior students which will demonstrate satisfactorily that the intensity of illumination varies inversely as the square of the distance from the source is not easy to arrange. The difficulty in varying the intensity of a source...
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Higher Mathematics for Students of Chemistry and Physics: With Special ...

Joseph William Mellor - Chemistry, Physical and theoretical - 1902 - 620 pages
...illumination. Let AB = a, and a the angle made by the incident rays SB = r on the surface B. It is known that the intensity of illumination varies inversely as the square of the distance of B, and directly as the sine of the angle of incidence. Since r'1 = a'2 + x'2, sin a = x/r...
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Elements of Physics

Ernest John Andrews, Howard Newell Howland - Physics - 1903 - 466 pages
...the light is three times as far away. The apparatus thus used is called the Bunsen photometer. This shows that the intensity of illumination varies inversely as the square of the distance. The brightness with which the light itself appears to the eye, however, does not change with...
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Elements of Physics

Ernest John Andrews, Howard Newell Howland - Physics - 1903 - 464 pages
...from the screen to each light. Repeat several times, with the lights at different distances. Assuming that the intensity of illumination varies inversely as the square of the distance from the source of light, determine the caudle power of the light. EXPERIMENT 58 Angles of...
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Elementary Algebra

Walter Randall Marsh - Algebra - 1905 - 412 pages
...a gas is 000 cc when the pressure is 60 cm., find the pressure if the volume is 150 cc 18. Knowing that the intensity of illumination, /, varies inversely as the square of the distance, D : if a candle throws a certain amount of light on a screen 2 feet distant, what will be...
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School Science and Mathematics, Volume 11

Education - 1911 - 946 pages
...equilibrium of moments of force. 3. Show, as a result of the fact that light travels in straight lines, that the intensity of illumination varies inversely as the square of the distance from the light to the body Humiliated. Define the following terms: focus, focal length, conjugate...
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Elements of Physics

Ernest John Andrews - 1906 - 472 pages
...the light is three times as far away. The apparatus thus used is called the Bunsen photometer. This shows that the intensity of illumination varies inversely as the square of the distance. The brightness with which the light itself appears to the eye, however, does not change with...
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College Algebra

Charles Hamilton Ashton, Walter Randall Marsh - Algebra - 1907 - 304 pages
...a gas is 600 cc when the pressure is 60 cm., find the pressure if the volume is 150 cc 18. Knowing that the intensity of illumination, /, varies inversely as the square of the distance, D ; if a candle throws a certain amount of light on a screen 2 feet distant, what will be...
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First Principles of Physics

Henry Smith Carhart, Horatio Nelson Chute - Physics - 1912 - 466 pages
...and 3 respectively. This experiment shows that the intensity of illumination varies inversely 'as the square of the distance from the source of light. If...than that expressed by the law of inverse squares. 232. The Bnnsen Photometer. — A photometer is an instrument for comparing the intensity of one light...
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First Principles of Physics

Henry Smith Carhart, Horatio Nelson Chute - Physics - 1912 - 472 pages
...1:4:9, and hence the quantity of light per unit of surface must be inversely as 1 : 4 : 9, the squares of 1, 2, and 3 respectively. This experiment shows...illumination varies inversely as the square of the distance from the source of light. If the medium is such as to absorb some of the light, the decrease...
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