MCQ
Mercury violet light $(\lambda = 4558{Å})$ is falling on a photosensitive material $(\phi = 2.5eV)$. The speed of the ejected electrons is in $m{s^{ - 1}}$, about
- A$3 \times {10^5}$
- ✓$2.65 \times {10^5}$
- C$4 \times {10^4}$
- D$3.65 \times {10^7}$
