What happens during radioactive decay?
a) daughter isotopes turn into energy.
b) daughter isotopes turn into parent isotopes.
c) parent isotopes turn into daughter isotopes.
d) energy turns into daughter isotopes.
e) parent isotopes turn into energy.

(c) parent isotopes turn into daughter isotopes

Explanation:

Whenever there is a radioactive decay then there is change of parent isotope into daughter isotopes. Parent isotopes is that which is present before the decay and daughter isotopes is that which is formed after the decay.

so the correct option will be option (c) as in option (c) it is given that parent isotopes turn into daughter isotopes

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.