24. Your DSLR camera might have flash light : it is generally a xenon gas filled

Question

24. Your DSLR camera might have flash light : it is generally a xenon gas filled tube (iust like neon signs over the shop/bar) connected with a capacitor. Let say average power of that tube is 3000 Watt, and the flash last only 0.05 s (typical exposure time !), and say the capacitance of the capacitor is 50F. what voltage was the capacitor initially charged before you light the flash ? (generally the power of flash light is specified by: guide number and s: can you find out how much is the power of your cell phones flashlight? will the battery (say: AAA) can provide that voltage if hook the battery directly to the capacitor ?) (a) 1.5 V (b) 6 V (c) 3.6 V (d) none of them NOTE: There are different kind of batteries : AA, AAA, AAAA,A B, C,D,F,A23,A27 : find out more about them. Search : "list of battery sizes" in wikipedia or other search engine. find out more.

Explanation / Answer

P = 3000 watt  

energy = power x time

= 3000 x 0.05

= 150 J

energy stored in capactor,

U= C V^2 / 2

150 = (50) V^2 / 2

V = 2.45 Volt

Ans: (d) none of them

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