Question

solve the above numerical...
It's urgent

Answer 1

we know that
1 Coulomb = 6.242×1018 eletrons


given 10^9 electrons take 1 secs


=> 10^9 electrons ------> 1 sec


=> 1 electrons ---------> 1/(10^9) secs


=> 6.242×1018 ------> 6.242×1018/ (10^9)


= 6.242×109 secs = 6.242×109/ (60*60*24*365)  years


=197.93 years
GUD Luck.

Answer 2

We know that 1C = 6.242×10^18 electrons

If it gives 10^9 electrons every sec. 

Then 1 electron =  1/(10^9) secs

Then 6.242×10^18  =  6.242 * 10^18 * 1/10^9  =  6.242 * 10^9 seconds

 Then,6.242×10^9 seconds = 6.242×10^9/ (60*60*24*365)  years 
                                              = 197.9 years           
                                              = ~ 198 years

                                         Hope this helps!