6000A and 7000Å

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A beam of light consists of four wavelength 4000Å, 4800A, 6000A and 7000Å, each of intensity 1.5×10^−3Wm^−2. The beam falls normally on an area 10^−4m^2 of a clean metallic surface of work function 1.9eV. Assuming no loss of light energy (i.e. each capable photon emits one electron) calculate the number of photoelectrons liberated per second.
29
Nov
A beam of light consists of four wavelength 4000Å, 4800A, 6000A and 7000Å, each of intensity 1.5×10^−3Wm^−2. The beam falls normally on an area 10^−4m^2 of a clean metallic surface of work function 1.9eV. Assuming no loss of light energy (i.e. each capable photon emits one electron) calculate the number of photoelectrons liberated per second. [...]
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Tags: 4800A , 6000A and 7000Å , A beam of light consists of four wavelength 4000Å , Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is ,