A Compact Disc of a CD Player Has a Moment

Multiple Choice

A compact disc of a CD player has a moment of inertia I = 2.5 × 10^-5 kg · m² and rotates at 500 rev/min. Taking L = Iω and using the quantization of angular momentum, the approximate value of n is = 1.055 × 10^-34 J · s)

A) 1.2 × 10³².
B) 2.0 × 10^{30 .}
C) 1.2 × 10³¹.
D) 130.
E) 3.5 × 10¹⁵.