Period of a pendulum at a height above the earth

1. A.
   Zero
2. B.
   23 s
3. C.
   4 s
4. D.
   infinite

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1. A.
   $\dfrac{1}{4}$
2. B.
   $\dfrac{1}{2}$
3. C.
   $2$
4. D.
   $4$

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1. A.
   $\dfrac{h\sqrt{l_h}}{\sqrt{l_s} - \sqrt{l_h}}$
2. B.
   $\dfrac{h\sqrt{l_h}}{\sqrt{l_h} - \sqrt{l_s}}$
3. C.
   $\dfrac{\sqrt{l_h}}{h(\sqrt{l_s} - \sqrt{l_h})}$
4. D.
   $\dfrac{\sqrt{l_s}}{h(\sqrt{l_h} - \sqrt{l_s})}$

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