A simple pendulum has a time period T₁ when on the earth’s surface and T₂ when taken to height R above the earth’s surface, where R
is the radius of the earth. The value of $\frac{{\mathrm{T}}_2}{{\mathrm{T}}_1}$ is

• A

  2

• B

  1

• C

  √2

• D

  4