what is the efficiency percebtage of christmas lights that give out 10J of light radiation for an electric transfer

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The answer is: 6.3mi got it right

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.