Find both the skin depth (δs) and the depth at which the e-field amplitude of a radio wave decreases to 1/1000 of its value at the ocean surface, at each of the frequencies 1 khz, 10 khz, 100 khz, 1 mhz, 10 mhz. take the parameters for seawater to be μr=1, =80, σ = 4 s/m. explain why submarines use ulf (ultra-low-frequency) radio waves at 1 khz to communicate?

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.

Aman jogs at a velocity of 2.5 m/s west for 1,200 s. he then walks at a velocity 1.0 m/s east for 500 s and then stops to rest . what is the displacement of man when he stops to rest?

Being able to see a square in the middle of the image despite not having lines to form a square represents the gestalt principle of a. proximity b. similarity c. closure d. continuity