The Inverse-Square Law for Light In this lab, an optical bench was set up with a

Question

The Inverse-Square Law for Light In this lab, an optical bench was set up with a lightbulb and a light meter to measure the brightness of the light at different distances from the source. The light bulb was measured at different distances from the meter. Two different bulbs were used, a 100 W and a 60 W bulb. The data collected appears in the tables below: 100 W bulb Int sition (cm) Distance d (cm) Source 15. 3. 100 110 0.78 0. 0. 60 W Position (cm) Distance d (cm) Source Intensity 6.98 3.1 1.74 501.12 078 0.57 0.44 20 30 40 70 0 0.28 1100.23 100 1. On a piece of graph paper, plot the data for both bulbs. Plot the intensity on the y-axis and distance (d) on the x-axis. 2. Draw a smooth curve through the data points for each bulb. 3. Answer the following questions for each of the bulbs: At d- 30 cm, 11-? At d-60 cm, 12-? At d-90 cm, 13- is 12 (1/4) 11

Explanation / Answer

1.

3. 100w and 60w

At d=30cm , 11 = 9.3856 and 21.20

At d=60cm, 12= 20.47 and 46.27

At d=90cm 13= 33.27 and 75.19

12=(1/4)*11 No 1/2 of 11.

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