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Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 11 - Dual Nature of Radiation and Matter > 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.

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.

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