Power factor or current of an LR or RC circuit when the frequency changes

1. A.
   $\frac{1}{\sqrt{2}}$
2. B.
   $\frac{1}{\sqrt{3}}$
3. C.
   $\frac{1}{\sqrt{5}}$
4. D.
   $\frac{1}{\sqrt{7}}$

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1. A.
   $\sqrt{\frac{6}{7}}$
2. B.
   $\sqrt{\frac{3}{5}}$
3. C.
   $\sqrt{\frac{7}{8}}$
4. D.
   $\sqrt{\frac{3}{4}}$

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