Answer:
Explanation:
In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium or for short the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
B the answer is b in this equation
Answer:
You would use a bar graph
Answer:
the sixth most abundant element in the earth's crust is sodium and it occupies 2.8%
True
False
True
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