The current in a wire is 4.0 amperes. the time
required for 2.5 × 10^19 electrons to pass a certain
point in the wire is
(1) 1.0 s (3) 0.50 s
(2) 0.25 s (4) 4.0 s

frequency or wavelenth of em radiation in a vacuum

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles