Photoelectrons Emitted Per Second Per Area

Light rays of wavelength 6000 A and of photon intensity 39.6 W/m² is incident on a metal surface. If only 1% of photons incident on surface emit photoelectrons, then the number of electrons emitted per second per unit area from the surface will be
(h = 6.64 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s)

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