The answer is A.number of protons in the nucleus.
To solve this problem divide 60 by 4.6
The answer to this problem is 13 seconds.
We don't even need to know how many pulses were produced
in those 3 seconds.
The beginning of the first pulse took 3 seconds to travel
45 centimeters from the generator.
Its speed is (45 cm) / (3 sec) = 15 cm/sec.
