Question

The kinetic energy, of an electron, having an associated deBroglie wavelength λ_B , equals K. The energy of a photon, of a radiation of wavelength λ_p , equals nK. The graph that is in accord with the relation between λ_B and λ_P , is the graph labelled as graph.

(1) A

(2) B

(3) C

(4) D

Answer 1

(3) C

For the electron, having a kinetic energy K, we have, as per deBroglie relation

The graph, between λ\(^2_B\) and  λ_p , would, therefore, a straight line, passing through the origin. It is only graph C that is in accord with these requirements.