Calculate the number of coulombs per second if the area is 4cm, recombination rate of hole is 1000 cm/s and the differential length is 2mm. (a) 1.28x10-23 (b) 1.28x10-22 (c) 1.28x10-17 (d) 1.28x10-20

number of coulombs =  1.28 ×

option b is correct

Explanation:

Given data

area A = 4cm

rate of hole r = 1000 cm/s

length L = 2mm

to find out

number of coulombs

solution

we will apply here  number of coulombs formula that is

number of coulombs =  e×A×L× r

put here value e = 1.6 ×  coulombs

and A = 4 × mand length = 2 × m

number of coulombs =  1.6 × × 4 ×  × 2 × × 1000

number of coulombs =  1.28 ×

so option b is correct

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

the total distance traveled by the car is

30km + 49km = 79 km .