Kepler’s third law, p2 = ka3, shows the relationship between a planet’s orbital period (p) and the length of its semi-major axis (a). which statement is true about kepler’s law? a. the orbital period is measured in units of time, and the semi-major axis is measured in units of mass. b. the value k is constant for each of the eight planets in our solar system. c. for a body orbiting the sun, increasing the orbital period increases the length of the semi-major axis. d. to calculate the value of k for a planet in our solar system, find a3 ÷ p2 for the planet.

B.The value k is constant for each of the eight planets in our solar system.

Explanation:

Kepler's third law states that the square of orbital period of the planet is proportional to the cube of semi-major axis.

P² = k A³

k is constant for all the planets in the solar system.

Where, G is the gravitational constant and M is the mass of the Sun.

The orbital period is measured in units of time, and the semi-major axis is measured in units of distance.

With increase in length of the semi-major axis, the orbital period increases.

The value of k can be found by: P²÷A³.

he . if i may ask what i your question exactly?

explanation:

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.