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Power saving of a bulb is directly proportional to square root [#permalink]

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04 Sep 2016, 09:41

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Difficulty:

55% (hard)

Question Stats:

55% (01:12) correct 45% (01:57) wrong based on 55 sessions

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Power saving (in %) of a bulb is directly proportional to square root of its efficiency. By how much % is power saving of bulb-1(efficiency 0.8) greater than power saving of bulb-2 (efficiency 0.2)?

Re: Power saving of a bulb is directly proportional to square root [#permalink]

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04 Sep 2016, 10:11

Shrivathsan wrote:

Power saving (in %) of a bulb is directly proportional to square root of its efficiency. By how much % is power saving of bulb-1(efficiency 0.8) greater than power saving of bulb-2 (efficiency 0.2)?

A. 60% B. 70% C. 80% D. 90% E. 100%

Power, \(P1 = k * sqrt(0.8)\)

Power, \(P2 = k * sqrt(0.2)\)

Difference = \(P1-P2 = k * sqrt(0.8) - k * sqrt(0.2)\)

Power saving of a bulb is directly proportional to square root [#permalink]

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13 Nov 2017, 09:53

abhimahna wrote:

Shrivathsan wrote:

Power saving (in %) of a bulb is directly proportional to square root of its efficiency. By how much % is power saving of bulb-1(efficiency 0.8) greater than power saving of bulb-2 (efficiency 0.2)?

A. 60% B. 70% C. 80% D. 90% E. 100%

Power, \(P1 = k * sqrt(0.8)\)

Power, \(P2 = k * sqrt(0.2)\)

Difference = \(P1-P2 = k * sqrt(0.8) - k * sqrt(0.2)\)