$2 \times 10^{-12}$
Step 1: 1 $\mu$m = $10^6$ pm.
Step 2: Given length is 6 $\mu$m. So, \[ x = 6 \times 10^6 { pm} \] Step 3: Therefore, the correct answer is (D).
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
Kepler's second law (law of areas) of planetary motion leads to law of conservation of