1. The gravitational field strength on the surface of the Earth is g. The gravitational field strength on the surface of a planet of twice the radius and the same density…

1. A student is asked: “What is meant by background radiation?” She writes: “It is the radiation produced by the rocks in the ground.” This answer is A B C D correct…

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1 1. A student is asked: “What is meant by background radiation?” She writes: “It is the radiation produced by the rocks in the ground.” This answer is A correct…