The sun is shown as a yellow circle. Which of the blue lines best represents the revolution of Earth?

A.
A circle made of a dashed blue line with a smaller yellow circle just inside the blue line is shown. The blue circle represents the revolution of Earth, and the yellow circle represents the sun.
B.
A circle made of a dashed blue line with a smaller yellow circle in the middle of the blue circle is shown. The blue circle represents the revolution of Earth, and the yellow circle represents the sun.
C.
A circle made of a dashed blue line with the blue line passing through a a smaller yellow circle is shown. The blue circle represents the revolution of Earth, and the yellow circle represents the sun.
D.
A circle made of a dashed blue line with a smaller yellow circle just outside the blue line is shown. The blue circle represents the revolution of Earth, and the yellow circle represents the sun.

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference