2.A trough of amplitude 8 m meets an opposing crest of amplitude 8 m. What is the amplitude of the point where interference occurs?

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 .

what is the question because that is not a question.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

the answer is 12 as i may remember

: )