Answer:
0.7707
Explanation:
From Snell's law,
n(1) * sin θ1 = n(2) * sinθ2
Where n(1) = refractive index of air = 1.0003
θ1 = angle of incidence
n(2) = refractive index of second substance
θ2 = angle of refraction
The angle of reflection through the unknown substance is the same as the angle of incidence of air. Thus this means that θ1 = 29°
=> 1.0003 * sin29 = n(2) * sin39
n(2) = (1.0003 * sin29) / sin39
n(2) = 0.7707
Explanation:
Buy a fan or heater, get a blanket, take a shower, go outside, go by the fireplace
Answer:
The Third Quarter Moon is when the opposite half of the Moon is illuminated compared to the First Quarter. Which half you see lit up depends on where you are on Earth. Only 50% of the Moon is illuminated during its third quarter phase.
The answer of a & b are force of cohesion and force of adhesion
Of rest two answers I don't know
<span>Roemer's experiment failed because of his ignorance about the dimensions of the Earth's orbit.
Roemer was trying to determine the actual speed of light in his experiments, back in the 17th century. People thought that couldn't possibly be done before him, but he proved them wrong. However, he wasn't precise either, because he miscalculated the actual Earth's orbit, thus making his experiment an incorrect one.
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