What discovery has prompted further examination and speculation about theories of migration to the americas, no longer considering travel across the land bridge of beringia as the only route? remains of emperor pachacuti kennewick man the serpent mound slash-and-burn agriculture

Which statement is correct? the speed of the light ray is the same in air and medium a. the speed of the light ray is the same in air and medium b. medium a and medium b have different densities because light refracts at different angles. medium a and medium b have the same density because the light ray strikes both at the same angle.