Which compound is most likely a powerful and dangerous acid?

Here's a list of 4 acids that are considerably more dangerous, including one that dissolves your body from the inside-out and another that eats through solids like the corrosive blood of the creature in the Alien 

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.