NEET 2009
- Exam
- NEET
- Year
- 2009
- Subject
- Chemistry
- Chapter
- Solid State
NEET 2009 · Chemistry · Solid State
The figure shows elliptical orbit of a planet m about the sun S ....
The figure shows elliptical orbit of a planet about the sun . The shaded area is twice the shaded area . If is the time for the planet to move from to and is the time to move from to , then
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
Key Idea Apply Kepler's law of area of planetary motion.
The line joining the sun to the planet sweeps out equal areas in equal time interval , areal velocity is constant.
or
\begin{array}{llrl}
\Rightarrow& \mathrm{t}}_{1} & =\frac{\mathrm{A}_1}{\mathrm{~A}_2} \mathrm{t}}_{2} \\
\text{ Given }& \mathrm{A}}_{1} & =2 \mathrm{~A}}_{2} \\
\therefore & \mathrm{t}}_{1} & =2 \mathrm{t}}_{2}
\end{array}$