Question 196: Dual Nature of Matter and Radiation

Question

In a photoelectric effect experiment the
threshold wavelength of the light is 380 nm. If
the wavelentgh of incident light is 260 nm, the
maximum kinetic energy of emitted electrons
will be:
Given E (in eV) = 1237/$$\lambda $$ (in nm)

Accepted Answer

$${K_{\max }} = {{hc} \over \lambda } - {{hc} \over {{\lambda _o}}}$$
$$ \Rightarrow {K_{\max }} = hc\left( {{{{\lambda _o} - \lambda } \over {\lambda {\lambda _o}}}} ight)$$
$$ \Rightarrow {K_{\max }} = \left( {1237} ight)\left( {{{380 - 260} \over {380 	imes 260}}} ight)$$
= 1.5 eV

Answer

4.5 eV

Answer

15.1 eV

Answer

3.0 eV

Answer

1.5 eV

Dual Nature of Matter and Radiation

In a photoelectric effect experiment the threshold wavelength of the light is 380 nm. If the wavelentgh of incident light is 260 nm, the maximum kinetic energy of emitted electrons will be: Given E (in eV) = 1237/$\lambda $ (in nm)

Choose the correct answer: