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What is the cause for light or dark recording of EEG?

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The energy radiated by Sun on a bright Sunny day is approximately: 

(A) 700 W/m² (B) 800 W / m² (C) 1 kW / m² (D) 2 kW / m²

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The energy radiated by Sun on a bright Sunny day is approximately: 1 kW / m²

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