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Intensity is a measure of incoming power per unit area. If el is the intensity of the incoming energy within an illuminated region of area, A, then the total received power is given by: P = JA where I depends on the power of the radiating source, how it spreads and how far away it is from the illuminated region. shlight on a Wall Suppose that a flashlight beam spreads uniformly over a circular region as shown in the figure above. (a) If Pbulb is the radiated power, and r is the radius of the circle, which expression gives the intensity, , within the illuminated region? Pbulb 4tr² Pbulb Пре Pbulb 2πr (b) Which expression should you use to calculate the total incoming (received) power, Pin, over a square of side length, s, that is completely illuminated by the beam as shown in the above figure? O shel 0 Hrael Ο Ampel 8 You shine the 13.5-cm radius circular beam of a 70-W flashlight on a square sticky-note with side length 8.1-cm that is tacked to a nearby wall as shown in the figure above. (c) What is the total (average) power received across the circular beam. W (d) What is the total (average) power received across a sticky note? W (d) What is the intensity of the incident light on the sticky note? W/m² Area, A Intensity. I

Intensity is a measure of incoming power per unit area. If el is the intensity of the incoming energy within an illuminated region of area, A, then the total received power is given by: P = JA where I depends on the power of the radiating source, how it spreads and how far away it is from the illuminated region. shlight on a Wall Suppose that a flashlight beam spreads uniformly over a circular region as shown in the figure above. (a) If Pbulb is the radiated power, and r is the radius of the circle, which expression gives the intensity, , within the illuminated region? Pbulb 4tr² Pbulb Пре Pbulb 2πr (b) Which expression should you use to calculate the total incoming (received) power, Pin, over a square of side length, s, that is completely illuminated by the beam as shown in the above figure? O shel 0 Hrael Ο Ampel 8 You shine the 13.5-cm radius circular beam of a 70-W flashlight on a square sticky-note with side length 8.1-cm that is tacked to a nearby wall as shown in the figure above. (c) What is the total (average) power received across the circular beam. W (d) What is the total (average) power received across a sticky note? W (d) What is the intensity of the incident light on the sticky note? W/m² Area, A Intensity. I

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Intensity is a measure of incoming power per unit area. If I is the intensity of the incoming energy within an illuminated region of area, A, then the total received power is given by: P = JA where I depends on the power of the radiating source, how it spreads and how far away it is from the illuminated region. lashlight on a Wall Suppose that a flashlight beam spreads uniformly over a circular region as shown in the figure above. (a) If P bulb is the radiated power, and r is the radius of the circle, which expression gives the intensity, , within the illuminated region? Pbulb P bulb 4πr² (b) Which expression should you use to calculate the total incoming (received) power, Pin, over a square of side length, s, that is completely illuminated by the beam as shown in the above figure? Os²el O² O 4πr²e bulb 2ftr You shine the 13.5-cm radius circular beam of a 70-W flashlight on a square sticky-note with side length 8.1-cm that is tacked to a nearby wall as shown in the figure above. (c) What is the total (average) power received across the circular beam. W (d) What is the total (average) power received across a sticky note? W (d) What is the intensity of the incident light on the sticky note? W/m² Area, A Intensity. I
Transcribed Image Text:Intensity is a measure of incoming power per unit area. If I is the intensity of the incoming energy within an illuminated region of area, A, then the total received power is given by: P = JA where I depends on the power of the radiating source, how it spreads and how far away it is from the illuminated region. lashlight on a Wall Suppose that a flashlight beam spreads uniformly over a circular region as shown in the figure above. (a) If P bulb is the radiated power, and r is the radius of the circle, which expression gives the intensity, , within the illuminated region? Pbulb P bulb 4πr² (b) Which expression should you use to calculate the total incoming (received) power, Pin, over a square of side length, s, that is completely illuminated by the beam as shown in the above figure? Os²el O² O 4πr²e bulb 2ftr You shine the 13.5-cm radius circular beam of a 70-W flashlight on a square sticky-note with side length 8.1-cm that is tacked to a nearby wall as shown in the figure above. (c) What is the total (average) power received across the circular beam. W (d) What is the total (average) power received across a sticky note? W (d) What is the intensity of the incident light on the sticky note? W/m² Area, A Intensity. I
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