The resistivity of a metallic, single-walled carbon nanotube is 2.30 ✕ 10−8 Ω · m. The electron number density is 6.60 ✕ 1028 m−3. What is the mean free time for the electrons flowing in a current along the carbon nanotube?

  The mean free time is given as z  

Explanation:

Generally the formula for resistivity

Where

              is he resistivity of metal

               is the mass of the electron

               is the charge of the electron

              is  electron density

            is the mean free time

  Now making z the subject  of the formula

              =>  

    Substituting the given values

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

search it up!

explanation: