Why does ethyl alcohol have a higher boiling point than methyl alcohol?

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On a distance vs time graph the line of an object at rest is a

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line