24. What causes the tail of the comet ? (A) Centrifugal force pushes away the gases/ (B) Lighter… 1 answer below »

                        24. What causes the tail of the comet ? (A) Centrifugal force pushes away the gases/ (B) Lighter gases are left behind during the orbital motion. (C) Tail of the comet always exists but becomes visible near the sun. (D) The radiation pressure from the sun causes the tail. 25. For a satellite to revolve very near to surface of the earth., the orbital velocity should be about : (A) 3 km s-1. (B) 8 kms-1 (C) 11 kms-1. (D) none of the above      

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