If the two metals A and B are exposed to radiation of wavelength 350 nm. The work functions of metals A and B are 4.8 eV and 2.2 eV. Then choose the correct option 

Energy of incident radiation $=\frac{12400}{3500}=3.54eV$

For metal A work function is higher than energy available

For metal B work function is less than 3.54 eV

So, B emits electrons.