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Biology, 23.12.2019 16:31 jagger68

The speed of light in four different materials is shown below:

material speed of light in thousand miles per second
a 140
b 78
c 186
d 124

which material is the most dense?
material a
material b
material c
material d

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The speed of light in four different materials is shown below:

material speed of light...

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