It could be radiation because radiation means <span>the emission of energy as electromagnetic wave, but potential fits it best</span>
We have that Zero signifies a perfect circle shape and 1 shows it maximum out of order shape.
From the question we are told
What does it mean when the orbital eccentricity of a planet is close to 1
Generally
Eccentricity
This in its simplest definition means to be eccentric which means to be a bit out of order or for the given subject at hand means to be a bit out of shape
Naturally the Eccentricity that an object possess is defined by two number 0(zero) to 1(one)
Where
Zero signifies a perfect circle shape and 1 shows it maximum out of order shape
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The answer is d that might help you
A peak = A Rms x Sq root 2
Therefore 3.6 x sq root of 2
A peak = 5.09