Light is incident on the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 1.2 × 10 6 m/s. What is the wavelength of the light?

Question

Light is incident on the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is $1.2 \times 10^{6}$ m/s. What is the wavelength of the light?

Smart Achievers · Accepted Answer

(4)

$\frac{h c}{λ} = K E_{\max} = φ$

Solution

Q.
Light is incident on the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is $1.2 \times 10^{6}$ m/s. What is the wavelength of the light

1 570 nm

2 710 nm

3 320 nm

4 194 nm

Ans.
(4)

$\frac{h c}{λ} = K E_{\max} = φ$

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