1. From an ideal point light source, light spreads out (a) uniformly in all dire
ID: 2304515 • Letter: 1
Question
1. From an ideal point light source, light spreads out (a) uniformly in all directions. (b) only in certain directions. 2. About light intensity at a location away from an ideal point light source: (a) it depends on the distance from the source to the location. (b) it is equal to intensity at another location if both locations are equally distant from the point light source. (c) the other 2 statements both are true. 3. Point A is closer to a point light source than point B. (a) (b) (c) Light intensity at A is larger than that at B. Light intensity at A is equal to that at B. Light intensity at A is smaller than that at B. 4 Point A is 10 cm away from a point light source and B is 30 cm away from the source, (a) Intensity at A intensity at B (b) Intensity at A intensity at B x3 (c) Intensity at A- intensity at B xS9 (d) Intensity at Ax 3- intensity at 8 (e) Intensity at A x 9 - intensity at B 5. The light intensity I vs. distance d's relation is expected to be I d where b is an exponent for you to find out by fitting your data by Excel. What Excel fitting function should you choose? (a) Linear (y a+bx) (b) Exponential (y b) (c) Power (y ax) (d) Logarithmic (y logox) (e) Polynomial ( y # a + bx + cx' + dx' )Explanation / Answer
1. a) uniformly in all direction
2.c)both statements are true
3.a)light intensity at A is larger
4.c)Light intensity at A=9*B
as light intensity varies with (1/R^2).
5 .c) y=axb ,If you fit it in excel you will get b=-2
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