What causes a bolt of lightning?

a. electrical charges build up in the clouds only.
b. electrical charges build up on the ground only.
c. electrical charges build up in the clouds and on the ground.
d. electrical charges build up in the space between the clouds and the ground.

Use the table to answer question 22 23 and 24.

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.