MCQ
When a light source of power $P$ emitting monochromatic light of wavelength $\lambda$ is kept at a distance $r$ from a photosensitive surface of work function $\phi$ and surface area $A$, we will have wrong option :-
- Athe maximum energy of emitted photoelectrons as $\frac{hc}{\lambda} - \phi$
- ✓the stopping potential needed to stop the fastest photoelectron as $e\left[ {\frac{{hc}}{\lambda } - \phi } \right]$
- Cthe number of photons striking the surface per unit times as $\frac{{P\lambda A}}{{4\pi hc{r^2}}}$
- DAll the above
