BITSAT2024ChemistryStructure of AtomActual
A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V volt. If 'e' and m are charge and mass of an electron, respectively, then the value of h / (where is wavelength associated with electron wave) is given by:
Options
- Am e V
- B2 m e V
- Cm eV
- D2 m e V
Correct answer
B. 2 m e V
Step-by-step solution
As electron of charge ' e ' is passed through ' V ' volt, kinetic energy of electron will be eV . Wavelength of electron wave ( )= h 2 m KE =- h 2 m eV h = 2 m eV