[单选题]
A proton of mass $1.67 \times 10^{-27} \; kg$ rotates with an angular speed of 2 x 106 rad/s in a circle of radius 0.80 m in a cyclotron. What is the orbital angular momentum of the proton?
A. $1.28 \times 10^{-21} \; kg \cdot m^{2}/s$
B. $1.76 \times 10^{-21} \; kg \cdot m^{2}/s$
C. $2.14 \times 10^{-21} \; kg \cdot m^{2}/s$
D. $3.20 \times 10^{-21} \; kg \cdot m^{2}/s$
Post time 2024-1-22 02:51:16