Question

When the ‘k’ corresponding to the free electron is doubled, its energy increases by a factor of ___

Answer 1

ANSWER:

Wavelength = h / mv also if kinetic energy is double it is due to √2 times increase in velocity. wavelength! = h / √2mv = 1/√2( h/ mv).

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Answer 2

The kinetic energy of the body is important informations in those definitions concerning with the momentum is mv.

Square of velocity v. Momentum is proportional to just the velocity of the object with kinetic energy K and momentum p and where m is the mass of the moving body and V.

K2mKpp2p=12mv2=m2v2=mv=m2v2=2mK=2mK−−−−√, Consider new K′=2K.p′=2mK′−−−−−√=2m(2K)−−−−−−−√=2–√2mK−−−−√=(2–√)p