The work function of a substance is 4.0eV . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

Question

The work function of a substance is 4.0eV . The longest wavelength of light that can cause photoelectron emission from this substance is approximately (A) 540nm (B) 400nm (C) 310nm (D) 220nm

Tardigrade Admin · Accepted Answer

The maximum wavelength which is responsible for emission of photoelectron is λ 0=(h c/W0)=(1240/4) = 310 nm

Q. The work function of a substance is $4.0 e V$ . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

$540 nm$

$400 nm$

$310 nm$

$220 nm$

The maximum wavelength which is responsible for emission of photoelectron is
$λ_{0} = \frac{h c}{W _{0}} = \frac{1240}{4}$
$= 310 nm$

Q. The work function of a substance is 4.0eV . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

540nm

400nm

310nm

220nm