You have a new job in an electronics manufacturing company. You are assigned to the photography department, specifically to work on electronic flash units for cameras. Your supervisor explains that, despite the availability and popularity of flash photography using smartphones, many photographers still prefer dedicated mountable flash units using xenon flash sources rather than the LED source in a smartphone camera. She is designing a new flash unit and wants you to determine the capacitance (in mF) needed to store the energy that will be released from the xenon source. She provides you with the following information. The capacitor will be charged to ΔV = 210 V before its energy is released. The energy from the capacitor will create a flash of light lasting for a time interval Δt = 1.34 ✕ 10−3 s. The energy release process is 92.0% efficient, in that 92.0% of the released energy transfers out of the unit by light, with an average light power of 3.05 ✕ 105 W.

Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter25: Capacitance And Dielectrics
Section: Chapter Questions
Problem 27P
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You have a new job in an electronics manufacturing company. You are assigned to the photography department, specifically to work on electronic flash units for cameras. Your supervisor explains that, despite the availability and popularity of flash photography using smartphones, many photographers still prefer dedicated mountable flash units using xenon flash sources rather than the LED source in a smartphone camera. She is designing a new flash unit and wants you to determine the capacitance (in mF) needed to store the energy that will be released from the xenon source. She provides you with the following information. The capacitor will be charged to

ΔV = 210 V

before its energy is released. The energy from the capacitor will create a flash of light lasting for a time interval

Δt = 1.34 ✕ 10−3 s.

The energy release process is 92.0% efficient, in that 92.0% of the released energy transfers out of the unit by light, with an average light power of 3.05 ✕ 105 W.

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