Question

A mass on a spring A oscillates at twice the frequency of the same mass on spring B. Which
statement is correct?
A. The spring constant for B is one quarter of the spring constant for A.
B. The spring constant for B is 4 times the spring constant for A.
C. The spring constant for B is half of the spring constant for A.
D. The spring constant for B is 1.41 times the spring constant for A.
E. The spring constant for B is twice the spring constant for A.

Answer 1

frequency is proportional to square root of k
so
to double frequency you need 4 times the original k