questionedithistorytranslations

When was the photovoltaic cell invented?

1839
1883
1946
1958
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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Answers by country

1839
1883
1946
1958
answers
flagthe United States
56%
28%
0%
15%
46
flagthe United Kingdom
45%
16%
12%
25%
24
flagAustralia
42%
42%
5%
10%
19
flagIndia
40%
20%
33%
6%
15
flagGreece
37%
31%
6%
25%
16
flagGermany
33%
29%
19%
16%
71
flagRepublic of Ireland
27%
36%
18%
18%
11
flagPoland
25%
33%
23%
17%
1155
flagAustria
0%
33%
50%
16%
12

The bright circle around the Sun seen in the picture is known as a halo. What causes it?

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface

What is larger in the sky: the Moon or the Sun? (By apparent size)

the Sun
the Moon
both are identical
sometimes the Moon, sometimes the Sun

In which month is the Earth closest to the Sun?

in January
in March
in June
there is no difference

What is special about Synalpheus Pinkfloydi shrimp?

hunting with sound
fluorescent colors
characteristic breeding dance
size