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10 questions from this quiz
Energy per second per unit area
Becomes one-quarter
One-ninth
I1r12=I2r22I_1 r_1^2 = I_2 r_2^2I1r12=I2r22
Doubles
960 W m−2960 \text{ W m}^{-2}960 W m−2
Gravitational and electrostatic forces
III versus 1/d21/d^21/d2
4πr24\pi r^24πr2
Earth receives 2.312.312.31 times more
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