A mass suspended from a spring bobs up and down one complete cycle every 2 s. Its period is
A) 0.5 s.
B) 1 s.
C) 2 s.
D) none of the above
Question 2
In - decay, the number of protons in the nucleus is
A) decreased by 1.
B) decreased by 2.
C) increased by 1.
D) increased by 2.
E) remains unchanged.