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(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 4tr² Pbulb Tr² 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? stel Omile Ο Απί 70 X 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

(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 4tr² Pbulb Tr² 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? stel Omile Ο Απί 70 X 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

Question
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? P bulb 4tr² (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? OP bulb πtr² Os²l πr² 04πr²✔ 70 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. P bulb 2πr (c) What is the total (average) power received across the circular beam. 2.01 W (d) What is the total (average) power received across a sticky note? x W 305.68 (d) What is the intensity of the incident light on the sticky note? x W/m²
Transcribed Image Text: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? P bulb 4tr² (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? OP bulb πtr² Os²l πr² 04πr²✔ 70 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. P bulb 2πr (c) What is the total (average) power received across the circular beam. 2.01 W (d) What is the total (average) power received across a sticky note? x W 305.68 (d) What is the intensity of the incident light on the sticky note? x W/m²
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. Area, A 0 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. Area, A 0 Intensity. I
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