The arctic tern flies from the arctic to the antarctic and back every year, a total distance of 22,000 miles! in late summer, the terns start their migration south, and it takes about 3 months to go the 11,000 miles. what is the average velocity, in miles per day, that these birds travel? (remember, velocity also includes direction! )

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.