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what’s could be the correct answer?

Iwll give extra points to who gets this for ! what type of reaction is this? ?

How does a hydroelectric power plant converts energy into energy.

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