A wave is moving from a medium where it travels at 15 m/s to a medium where it travels 20 m/s. If the wave hits the transition at 15 degrees, what is
the angle of refraction?

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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i think the answer is a, hope this : )

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.