[单选题]
How fast should a moving clock travel ,s e sw9a+0 j(si7,beb6ypdkp if it i iwxom4x+bl5c ;k pcig.:7h2d s to be observed by a stationary obsd54p+ bxlxi2:i .;cocm7khwg erver as running at one-half its normal rate?
A. $0.50 \; c$
B. $0.65 \; c$
C. $0.78 \; c$
D. $0.87 \; c$
Post time 2024-1-14 16:03:04