A scientist in this family served as a research assistant to then-professor Heinrich Hertz, and names a force that acts on a bubble in a sound wave. Lewis Fry Richardson used differential equations to model data (15[1])from research stations founded by a scientist from this family. Two scientists in this family developed polar front theory, which they named for WWI troop movements. A positive feedback loop between surface wind and (*) ocean temperature is named after a member of this family. That scientist of this family gave the name “Walker (10[1])circulation” to the interaction between the Southern Oscillation and El Niño. Another scientist from this family discovered the “primitive equations” and founded the Bergen School of (10[1]-5[2])meteorology. (10[1])For 10 points, what family includes Jacob and Vilhelm, a pair (10[1])of Norwegian meteorologists? (0[5])■END■