Work function of sodium is $2.3 e V$ . Does sodium show photo-electric emission for light wavelength $6800 ˚ A$ ?

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Solution

from the photoelectric equation.
$E = W + K . E$
$E = h v = \frac{1240}{680} = 1.82 e V$
which is less than $2.3 e V$
no photoelectric effect would happen.

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Work function of sodium is 2.3eV. Does sodium show photo-electric emission for light wavelength 6800˚A?

from the photoelectric equation. E=W+K.EE=hv=1240680=1.82eV which is less than 2.3eV no photoelectric effect would happen.

Work function of sodium is $2.3 e V$ . Does sodium show photo-electric emission for light wavelength $6800 ˚ A$ ?

from the photoelectric equation.
$E = W + K . E$
$E = h v = \frac{1240}{680} = 1.82 e V$
which is less than $2.3 e V$
no photoelectric effect would happen.