Question

What is the wavelength of a proton that has a velocity of 2.1x 10° m/s?

Answer 1

The wavelength of the proton can be found using Debroglie Wavelength Formula

$\lambda =h/mv$

Where,

h=6.626x10^(-34)J-sec

m=mass of a proton which is 1.67x10^(-27)kg.

v=given velocity which is 2.1x10^(6)m/s

Therefore by putting all these values in an appropriate position

We end up with

$\lambda =$ {6.626x10^(-34)J-sec} / {(1.67x10^(-27)kg x2.1x10^6 m/s)}

= 1.889x10^(-3) Å

Where Å is Angstrom which 1x10^(-10)

This is the value of wavelength.