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PHYSICS CH9 Universe — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9SciencePHYSICS CH9 Universe1 Mark
Question
Give a reason for changes of seasons on Earth.
✓

Answer

Semi major axis from sun, $R=149.6 \times 10^6 km$.
Period of Earth, $T=1$ year.
The ratio $=\frac{T^2}{R^3}=\frac{(1)^2}{\left(149.6 \times 10^6\right)^3}=2.98 \times 10^{-25}$ year $^2 / km ^3$.
  • Earth is not perpendicular to the plane of its orbit.
  • This tilt is responsible for the change of seasons on earth.

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