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In the following, assume that light bulbs radiate
Chapter 25, Problem 54P(choose chapter or problem)
Problem 54P
In the following, assume that light bulbs radiate uniformly in all directions and that 5.0% of their power is converted to light. (a) Find the average intensity of light at a point 2.0 m from a 120-W red lightbulb (λ = 710 nm). (b) Is the average intensity 2.0 m from a 120-W blue light bulb (λ = 480 nm) greater than, less than, or the same as the intensity found in part (a)? Explain. (c) Calculate the average intensity for part (b).
Questions & Answers
QUESTION:
Problem 54P
In the following, assume that light bulbs radiate uniformly in all directions and that 5.0% of their power is converted to light. (a) Find the average intensity of light at a point 2.0 m from a 120-W red lightbulb (λ = 710 nm). (b) Is the average intensity 2.0 m from a 120-W blue light bulb (λ = 480 nm) greater than, less than, or the same as the intensity found in part (a)? Explain. (c) Calculate the average intensity for part (b).
ANSWER:
Step 1 of 3
(a) The intensity of the red bulb is given by,
