- Home
- Standard 12
- Physics
11.Dual Nature of Radiation and matter
hard
The work function of a substance is $3.0\ \mathrm{eV}$. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:
A
$215 \mathrm{~nm}$
B
$414 \mathrm{~nm}$
C
$400 \mathrm{~nm}$
D
$200 \mathrm{~nm}$
(JEE MAIN-2024)
Solution
For $P.E.E.$ : $\lambda \leq \frac{h c}{W_e}$
$\lambda \leq \frac{1240 \mathrm{~nm}-\mathrm{eV}}{3 \mathrm{eV}}$
$\lambda \leq 413.33 \mathrm{~nm}$
$\lambda_{\max } \approx 414 \mathrm{~nm}$ for $P.E.E.$
Standard 12
Physics
Similar Questions
hard
