A) \[mm'+pp'=1\]
B) \[\frac{m}{m'}+\frac{p}{p'}=-1\]
C) \[\frac{m}{m'}+\frac{p}{p'}=1\]
D) \[mm'+pp'=-1\]
Correct Answer: D
Solution :
Given equations off lines are x = my + n, z = py + q and x = m? y + n?, z = p? y + q? These equations can be rewritten as\[\therefore \] and \[{{V}_{A}}:{{V}_{N}}={{10}^{15}}:1\] These lines will be perpendicular, if mm' + 1 pp? = 0 \[{{T}_{1/2}}=4.47\times {{10}^{8}}yr\] mm? + pp? = - 1
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