work function of a metal is 2.3eV. Calculate the threshold frequency of the metal
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Wf = 2.3eV = 2.3×1.6×10^-19J = 3.68×10^-19
work function :- work done to break electrostatic force of attraction between one outer most electron and nucleus . (It is same for same metal )
Threshold frequency :- Minimum frequency above which only photoelectric phenomenon starts .
If something work is done means some energy consumed
i.e
work function = energy consumed
Wf = E
E = hv
where
h = Plank's constant
v = threshold frequency
E = energy consumed
E = hv
3.68×10^-19 = 6.626×10^-34 × v
v = 3.68/6.626 × 10^-19/10^-34
v = 0.556 × 10^-19-(-34)
v = 0.556 × 10^15
v = 5.56 × 10^14 Hz
or
v = 556 × 10^12Hz
v = 556THz (i.e 556 Tera Hertz )
work function :- work done to break electrostatic force of attraction between one outer most electron and nucleus . (It is same for same metal )
Threshold frequency :- Minimum frequency above which only photoelectric phenomenon starts .
If something work is done means some energy consumed
i.e
work function = energy consumed
Wf = E
E = hv
where
h = Plank's constant
v = threshold frequency
E = energy consumed
E = hv
3.68×10^-19 = 6.626×10^-34 × v
v = 3.68/6.626 × 10^-19/10^-34
v = 0.556 × 10^-19-(-34)
v = 0.556 × 10^15
v = 5.56 × 10^14 Hz
or
v = 556 × 10^12Hz
v = 556THz (i.e 556 Tera Hertz )
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