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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 18 - Atoms and Nuclei > A beam of light has three wavelengths 4144 A o, 4972 A ˚ and 6216 A ˚ with a total intensity of 3.6×10^−3 Wm^−2 equally distributed amongst the three wavelengths. The beam falls normally on an area 1.0 cm^2 of a clean metallic surface of work function 2.3 eV. Assume that the there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate a number of photoelectrons liberated in two seconds.

A beam of light has three wavelengths 4144 A o, 4972 A ˚ and 6216 A ˚ with a total intensity of 3.6×10^−3 Wm^−2 equally distributed amongst the three wavelengths. The beam falls normally on an area 1.0 cm^2 of a clean metallic surface of work function 2.3 eV. Assume that the there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate a number of photoelectrons liberated in two seconds.

A beam of light has three wavelengths 4144 A o Beta rays emitted by a radioactive material are.