An electron and a proton have the same momentum. What is the ratio lambda_electr

Question

An electron and a proton have the same momentum. What is the ratio lambda_electron/lambda_proton of their DeBroglie wavelengths? 1 42.8 1830 3,360,440 12) A magnesium surface has a work function of 3.68 eV. Electromagnetic waves with a wavelength of 215 nm strike the surface and eject electrons. What is the maximum kinetic energy of the ejected electrons? 1.6 eV 2.1 eV 3.4 eV 5.2 eV 13) If the intensity of the light striking the surface is increased, what will happen to the maximum kinetic energy of the ejected electrons? it will increase it will decrease it will remain the same 14) If the wavelength of the light striking the surface is increased, what will happen to the maximum kinetic energy of the ejected electrons? it will increase it will decrease it will remain the same

Explanation / Answer

11)

wavelength = h/momentum

answer ) 1

12)

KE = hc/wavelength - 3.68

KE = 2.1 eV

13)

will remain same

14)

will decrease

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