It is noticed that one of the natural frequencies of NaCl crystal is 5.3x10¹⁵ Hz. If placed under pressure, the frequency is increased by a factor of 0.11 due to the compression of the atomic lattice changing the atomic spring constant. What is the relative change in the spring constant (∆k/k) Select one:
a. 0.11
b. 5.3×10-13
c. 0.33
d. 0.23
