Physicshard · Past Paper
At what depth from the surface of Earth does the value of 'g' become half of its surface value? (R is Earth radius)
AR/2
BR/4
CR
D2R
✓ Correct Answer: A — R/2
Inside Earth, g' = g(1 - d/R). For g' = g/2, 1/2 = 1 - d/R, so d = R/2.
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