When was the photovoltaic cell invented?
The first experimental photovoltaic cell has been built by Edmund Becquerel, French physicist aged 19 at the time, in his father garage in 1839. In 1883 Charles Fritts created the first solid state cell.
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What is larger in the sky: the Moon or the Sun? (By apparent size)
both are identical
sometimes the Moon, sometimes the Sun
What is the temperature of the center of the Sun?
16 thousand degrees Celsius
16 million degrees Celsius
16 billion degrees Celsius
16 trillion degrees Celsius