MCQ
Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelenght $8000\,\mathop A\limits^o $. What should be the maximum velocity of emitted electron when the same metal surface is exposed to radiation of wavelength $5000\,\mathop A\limits^o $ ? $\left( {h = 6.6 \times {{10}^{ - 34}}}\ J.s \right)$
- A$5.74 \times {10^6}\ ms^{-1}$
- ✓$5.74 \times {10^5}\ ms^{-1}$
- C$5.74 \times {10^4}\ ms^{-1}$
- D$5.74 \times {10^7}\ ms^{-1}$