Question

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

Answer 1

Answer:

number of coulombs =  1.28 × $10^{-22}$

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 × $10^{-19}$  coulombs

and A = 4 × $10^{-4}$ mand length = 2 × $10^{-3}$ m

number of coulombs =  1.6 × $10^{-19}$ × 4 × $10^{-4}$  × 2 × $10^{-3}$ × 1000

number of coulombs =  1.28 × $10^{-22}$

so option b is correct