How is a solution diluted?
a. water is added to it
b. a chemical is removed from it
c. it is heated up
d. it is concentrated
give me the right answer not a false one : ) -

Am i correct on these two physics questions?

When a pendulum is held high and taut and then is released, the pendulum begins to swing. what’s the correct order of the energy transformations in this example? (pe stands for potential energy.)

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.