Why is charcoal black?

question 4 options:

a. charcoal reflects black-colored light.

b. charcoal has a black-colored pigment.

c. charcoal absorbs all wavelengths of light that fall on it.

d. charcoal reflects all wavelengths of light that fall on it.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

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