Dr. James Van Allen was an American space scientist. Dr. James Van Allen and his group of united states scientists discovered a set of radiation belts. These belts are also known as Van Allen belts.
These belts are invented in the US when the first US satellite had been launched in 1958.
So, the correct option is (d) " radiation belts ".
The string moves to the right, as it restores its original position with the median plane of the bow. As a result, the string "pulls" on the arrow with a force F2. 2. The tip of the arrow T moves slightly to the left.
