A monochromatic source delivers $2.0 mW$ of light of wavelength $400 nm$ to a photocell. Only $0.50%$ of the incident photons eject an electron, and every ejected electron is collected. Use $h = 6.626 \times 1 0^{- 34} J s$ , $c = 3.0 \times 1 0^{8} m s^{- 1}$ , $e = 1.6 \times 1 0^{- 19} C$ . The photocurrent is closest to

A3.22 $μ$ A
B0.00 mA
C322 $μ$ A
D6.44 $μ$ A

Answer: A

Photon energy = hc/

λ

= 4.9695e-19 J. Photons per second = 2.0e-3/4.9695e-19 = 4.025e+15. Electrons per second = 0.005 x 4.025e+15 = 2.012e+13. Current = 2.012e+13 x 1.6e-19 = 3.220e-06 A = 3.22 microamp.

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A monochromatic source delivers 2.0 mW of light of wavelength 400 nm to a photocell. Only 0.50% of the incident photons eject an electron, and every ejected electron is collected. Use h=6.626×10−34 Js, c=3.0×108 ms−1, e=1.6×10−19 C. The photocurrent is closest to

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