The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.3 103 km路s-1?What wavelength of radiation must be used to eject electrons with a velocity of 1.3 103 km路s-1?
this is photoelectric effect
h蠀=w+k
k kinetic energy
w work function
h蠀 photon energy
h planck's constant
蠀 frequency
v speed of eject electron 1.3103 x 10鲁 m/s
m electron mass
k=陆m.v虏
h蠀=w+陆m.v虏
h蠀=E photon energy
E/h=蠀
c speed of the light
c/蠀=位 -%26gt;wave length of radiation
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