2. what is the approximate mass of an atom that
contains 26 protons, 26 electrons and 19 neutrons?
a) 26 u b) 45 u c) 52 u d) 71 u
1
.

b. 45 u

Explanation:

the mass of an atom is equal to the protons plus neutrons:

26+19=45

hope this helps :)

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

thats how its supposed to be