Question

a spherical copper particle has about 125 atoms . If the radius of copper is 140pm ,the diameter of the particle is close to the wavelength of​

Answer 1

Answer:

electron beam of energy 1.4eV

Answer 2

Answer:

given =  atmos =125 atoms

            radius = 140pm

to find = diameter of the particle.is close to wavellenth ?

solution=

volume of copper particle = 125 × vol of one atom.

                 $\frac{4}{3 }$πR³       = 125 ×   $\frac{4}{3 }$πR³

                              R = 5r

                              r= R/5 = 140/5×10⁻¹²

                              r =28 x 10⁻¹²

                           diameter = 2 x radius.

                           diameter  = 2  x 28 x 10⁻¹²

                           diameter  = 56 pm

the closest wavelength of diameter of particle is 56pm.