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Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 11 - Dual Nature of Radiation and Matter > Two separate monochromatic light beams A and B of the same intensity (energy per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are λA and λB respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam A to that from B is

Two separate monochromatic light beams A and B of the same intensity (energy per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are λA and λB respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam A to that from B is

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