MCQ
The light of wavelength ' $\lambda$ '. incident on the surface of metal having work function $\phi$ emits the electrons. The maximum velocity of electrons emitted is [ $c=$ velocity of light, $h =$ Planck's constant, $m =$ mass of electron]
- A$\left[\frac{2( hc -\phi)}{ m \lambda}\right]$
- ✓$\left[\frac{2( hc -\lambda \phi)}{ m \lambda}\right]^{\frac{1}{2}}$
- C$\left\lceil\frac{2( hv -\phi) \lambda}{ mc }\right\rceil$
- D$\left[\left[\frac{2( hc -\lambda)}{ m \lambda}\right]^{\frac{1}{2}}\right.$