Estimate the peak electric field inside a 1.2-kW microwave oven under the simplifying approximation that the microwaves propagate as a plane wave through the oven's 700-cm2 cross-sectional area.

The peak electric field is  

Explanation:

From the question we are told that

     The power is  

     The cross-sectional area is  

Generally the average intensity of the  microwave is mathematically represented as

Where   is the speed of light with value  

     and   is the permitivity of free space with value

   also is the peak electric field.

Now making the subject

But this intensity of the  microwave can also be represented mathematically as

substituting values

      ]  

So

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.