# Photoelectric emission is observed from a surface for frequencies ${\mathrm{\nu }}_{1}$ and ${\mathrm{\nu }}_{2}$ of the incident radiation $\left({\mathrm{\nu }}_{1}>{\mathrm{\nu }}_{2}\right)$ if maximum kinetic energies of the photo electrons in the two cases are in the ratio , then the threshold frequency is given by :

1. A

$\frac{{\mathrm{\nu }}_{2}-{\mathrm{\nu }}_{1}}{\mathrm{K}-1}$

2. B

$\frac{{\mathrm{K\nu }}_{2}-{\mathrm{\nu }}_{1}}{\mathrm{K}-1}$

3. C

$\frac{{\mathrm{K\nu }}_{2}-{\mathrm{\nu }}_{1}}{\mathrm{K}}$

4. D

$\frac{{\mathrm{K\nu }}_{1}-{\mathrm{\nu }}_{2}}{\mathrm{K}-1}$

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