The magnetic field associated with a light wave is given, at the origin, by B=B_0[sin(3.14 × 10^7...

The magnetic field associated with a light wave is given, at the origin, by B=B_0[sin(3.14 × 10^7) c t+sin(6.28 × 10^7) c t].
If this light falls on a silver plate having a work function of 4.7 eV, what will be the maximum kinetic energy of the photo electrons (c=3 × 10^8 ms^-1, h=6.6 × 10^-34 J-s)
[JEE (Main) 2019]
(a) 6.82 eV
(b) 12.5 eV
(c) 7.72 eV
(d) 8.52 eV

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