The Speed of Alpha Particles from ²¹⁰Po Is 1 $\times$ 10⁷ M/s

Multiple Choice

The speed of alpha particles from ²¹⁰Po is 1.6 $\times$ 10⁷ m/s.The recoil atom will have a speed of approximately

A) zero
B) 76 km/s
C) 3.1 $\times$ 10⁵ m/s
D) 1.6 $\times$ 10⁷ m/s
E) 6.4 $\times$ 10⁷ m/s