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Physics · PYQ NEET UG 2018

हिन्दी

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are \( K_A \), \( K_B \) and \( K_C \), respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

  1. K_A < K_B < K_C
  2. \( K_A > K_B > K_C \)
  3. K_B < K_A < K_C
  4. \( K_B > K_A > K_C \)

Correct answer · Option 1

K_A < K_B < K_C

Explanation

By conservation of angular momentum and energy, velocity is maximum when closest to the Sun (point C) and minimum when farthest (point A). Therefore, \( K_A < K_B < K_C \).

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