A spring is compressed 1.3 cm. How far must you compress a spring with twice the spring constant to store the same amount of energy?

Explanation:

The energy stored is E = 1/2 kx^2.

E1 = E2

1/2 k(1.3)^2 = 1/2 (2k)x^2

x^2 = 1/2 (1.3)^2

x = 1.3/sqrt(2) cm

x =0.919 cm

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your answer is, orbit around the nucleus

option number c is the right answer.