KE= E photon - º
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Transcribed Image Text:Chemistry
The work function (4) of sodium (Na) is 2.30
eV. Calculate the velocity in m/se of the
emitted electrons when Na(s) is exposed to
a beam of light whose frequency is
7.62X1015 sec-1 knowing that the mass of
the electron is 9.11 x 10
10-28
g; lev =
1.602X10-19 Joule; h= 6.626X10-34 J.sec;
KE= E photon - P and KE = ½ mv2, Speed
of light C is 3X108 m.sec
A) 5.34 X105 m.sec-1
B) 3.21 X106 m.sec-
C) 4.94 X108 m.sec-1
D) 8.62 X107 m.sec-1
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