The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately)

Question

The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately) (A) 3100 nm (B) 966 nm (C) 31 nm (D) 310 nm

Tardigrade Admin · Accepted Answer

φ = (hc/λ) ⇒ 4 eV = (1240/λ) ⇒ = (1240/4) = 310 nm

Q. The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately)

3100 nm

966 nm

31 nm

310 nm

$ϕ = \frac{h c}{λ}$
$\Rightarrow 4 e V = \frac{1240}{λ}$
$\Rightarrow= \frac{1240}{4} = 310 nm$

Q. The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately)

3100 nm

966 nm

31 nm

310 nm

ϕ=λhc​ ⇒4eV=λ1240​ ⇒=41240​=310nm

$ϕ = \frac{h c}{λ}$
$\Rightarrow 4 e V = \frac{1240}{λ}$
$\Rightarrow= \frac{1240}{4} = 310 nm$