Understanding Neptune's Revolution Period
The question asks for Neptune's period of revolution around the Sun specifically measured in units of Neptune years.
Definition of a Planetary Year
- A "Neptune year" is defined as the time it takes for Neptune to complete one full orbit (revolution) around the Sun.
- By definition, any planet's period of revolution, when measured in its own years, is always equal to 1.
Neptune's Orbital Period
Therefore, Neptune's period of revolution around the Sun, measured in Neptune years, is 1.
The information about Neptune being approximately 30 times farther from the Sun than Earth relates to calculating Neptune's orbital period in Earth years using Kepler's Third Law ($T^2 \propto a^3$), which would yield approximately 165 Earth years. However, this calculation is not needed because the question specifies the unit as "Neptune years".
Important Questions from Planetary Bodies
- The correct sequence of planets in order of increasing surface temperature is:
- Atmosphere of planet Mars is almost entirely made up of $\text{CO}_2$. But the surface temperature of Mars is less than that of the Earth because:
- Consider two planets A and B with radii $2r$ and $r$, respectively. Let their distances from the Sun be $d$ and $2d$, respectively. The solar constants for A ($F_{\text{SA}}$) and B ($F_{\text{SB}}$) are related by
A planet of radius $r$ has a core of radius $r_c$ and a mantle. It has no crust. Its mean density is $\rho$ and the density of its core is $\rho_c$. What is the density of the mantle?
Given the following information, calculate the dry adiabatic lapse rate in Jupiter’s atmosphere.
Composition Specific heat Acceleration
due to gravity$\text{H}_2$ $13000\ \text{J/kg/K}$ $26\ \text{m/s}^2$
