A beam of electromagnetic radiation of intensity 6.4 × 10- 5 W /cm2 is comprised of wavelength, λ = 310 nm. It falls normally on a metal (work function varphi = 2eV) of surface area of 1 cm2. If one in 103 photons ejects an electron, total number of electrons ejected in 1 s is 10x. (hc = 1240 eVnm, le V = 1 .6 x 10-19 J), then x is . Given 4 (A) (B) (C) (D)

Q. A beam of electromagnetic radiation of intensity $6.4 \times 1 0^{- 5} W / c m^{2}$ is comprised of wavelength, $λ = 310 nm$ . It falls normally on a metal (work function $φ = 2 e V$ ) of surface area of $1 c m^{2}$ . If one in $1 0^{3}$ photons ejects an electron, total number of electrons ejected in 1 s is $1 0^{x}$ . ( $h c = 1240 e Vnm, l e V = 1.6 x 1 0^{- 19} J$ ), then x is __________ .
Given 4

1675 271 JEE MainJEE Main 2020Dual Nature of Radiation and Matter Report Error

Answer: 11.00