In the experiment on photoelectric effect, the graph between E_K(max) and v is found to be a straight line as shown in figure. The threshold frequency and Planck's constant according to this graph are

• A

  $3.33\times {10}^{18}{\mathrm{s}}^{-1},6\times {10}^{-34}\mathrm{J}-\mathrm{s}$

• B

  $6\times {10}^{18}{\mathrm{s}}^{-1},6\times {10}^{-34}\mathrm{J}-\mathrm{s}$

• C

  $2.66\times {10}^{18}{\mathrm{s}}^{-1},4\times {10}^{-34}\mathrm{J}-\mathrm{s}$

• D

  $4\times {10}^{18}{\mathrm{s}}^{-1},3\times {10}^{-34}\mathrm{J}-\mathrm{s}$