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A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power 2000 W for 0.04 s. The flash is due to discharge of a fully charged capacitor of 40 $μ F$ . The voltage to which it is charged before a flash is given by the unit is

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3000 V

1500 V

2000 V

2500 V

answer is B.

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Detailed Solution

$2000 \times 0.04 - \frac{1}{2} \times 40 \times 10^{- 6} V^{2}$

or $V^{2} = 4 \times 10^{6} o r V = 2000 V$

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