JEE Main2016ChemistryStructure of AtomActual
A stream of electrons from a heat filament was passed between two charge plates kept at a potential difference V esu . If e and m are charge and mass of an electron, respectively, then the value of h λ (where λ is wavelength associated with the electron wave) is given by:
Options
- Am e V
- B2 m e V
- Cm e V
- D2 m e V
Correct answer
B. 2 m e V
Step-by-step solution
Given, stream of electron from heated filament was passed between two charge plates at potential difference V . e   and   m are charge and mass of electron, respectively. V = Energy e e V = 1 2 × m × v 2 λ = h m v       v = h m λ e V = 1 2 × m × h m λ 2 h λ = 2   m e V