Ignoring reflection at the air-water boundary, if the amplitude of a 10 ghz incident wave in air is 20 v/m at the water surface, at what depth will it be down to 1 µv/m? water is characterized by er = 81, µr = 1, and σ = 0.1 s/m. can water described above, at 10 ghz, be described as a low-loss dielectric, good conductor, or "in-between"?

0.80267 m

Explanation:

E(z) = Electric field = 1 µV/m

= 20 V/m

z = Depth

= Conductivity = 0.1 S/m

= 81

= Impedance of free space =

Frequency is given by

Parameter is given by

From the first equation

The depth is 0.80267 m

heat the gas and measure the pressure

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.