Discussion
Assertion (A): The sun contributes less to the tide than the moon despite its far greater mass.
Reason (R): The tide generating force falls off with the cube of distance rather than the square.
Answer: D
Both are true and the reason gives the dependence, and distance therefore outweighs mass here. The solar contribution is nonetheless large enough to produce the spring neap cycle. Reinforcement and cancellation give the fortnightly rhythm.
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