 | 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... | |
 | 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... | |
 | 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... | |
 | 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... | |
 | Ernest John Andrews - 1906 - 472 pages
...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... | |
 | Charles Hamilton Ashton, Walter Randall Marsh - Algebra - 1907 - 304 pages
...pressure is 38 cm. 17. Under the conditions given in the preceding problem, if the volume of a gas is 600 cc when the pressure is 60 cm., find the pressure...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... | |
 | Henry Smith Carhart, Horatio Nelson Chute - Physics - 1912 - 472 pages
...surface must be inversely as 1 : 4 : 9, the squares of 1, 2, 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 the medium is such as to absorb some of the light, the decrease... | |
 | Carleton John Lynde - Home economics - 1914 - 340 pages
...placed in a kitchen, dining room, hall, and dressing rooms? Why? 4. Describe an experiment to show that the intensity of illumination varies inversely as the square of the distance between the source of light and the object illuminated. 5. Describe the Bunsen photometer.... | |
 | William Ballantyne Anderson - Physics - 1914 - 380 pages
...surface as in the first. Hence, the illumination would be 1/9 as intense, and we have therefore proved that the intensity of illumination varies inversely as the square of the distance from the lamp. An exactly similar proof would show that the same law applies in the case of... | |
 | Society of Motion Picture Engineers - Cinematography - 1918 - 102 pages
...great a candle-power as B, but recalling the inverse square law referred to on page 14, which states that the intensity of illumination varies inversely as the square of the distance, or what is the same thing, that the candle-power necessary to produce a given illumination... | |
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Now all know that the intensity of illumination varies inversely as the square of the distance. 
