question_answer

Electrons are emitted from an electron gun at almost zero velocity and are accelerated by an electric field E through a distance of 1.0 m. The electrons are now scattered by an atomic hydrogen sample in the ground state. What should be the minimum value of E so that red light of wavelength \[656.3nm\]may be emitted by the hydrogen? If its value is\[a\times 6.05eV\]. Find the value of a.

Answer:

2.00