The atomic symbol mc025-1.jpg represents potassium-40 (k-40), a radioactive isotope that has 19 protons and 21 neutrons. which atomic symbol could represent an isotope that results from the decay of k-40?

a) 40 ar
18

b) 40 k
18

c) 42 ca
20

d) 42 k
20

The correct option is A.

Explanation: For a radioactive isotope of potassium, which is having 19 protons and 21 neutrons, the decay processes are beta-decay and electron capture.

Potassium-40 undergoing decay processes:

From the two processes, the K-40 isotope forms by electron capture. So, the correct option is A.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong