According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of:
A)10-35 m.
B)10-15 m.
C)10-10 m.
D)10-8 m.
E)10-3 m.

Question

Quizplus · Accepted Answer

In string theory, the extra dimensions are compactified or "curled up" at the Planck scale, which is around 10^-35 meters, making them too small to be observed directly.

According to String Theory, Six Space-Time Dimensions Cannot Be Measured