Question

The table below shows the average distances of Venus and Earth from the sun.
-Name of Planet -Distance from the sun (in AU)
Venus 0.72
Earth 1.0

What is the difference between the orbital periods of Venus and Earth?
a. 1.72 years
b. 1.62 years
c. 0.62 years
d. 0.28 years

Answer 1

Looks like physics, not biology.

Venus goes around faster than Earth, so its period must be less than Earth's 1.0 years. That eliminates the first two answers. My recollection is that T^2 = k r^3, relating period of orbit to radius, so T should be
(0.72/1.00)^3/2 = 0.61 of the Earth's period, so 0.62 is ans.