1. Tardigrade
  2. Question
  3. Physics
  4. 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

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Q. A beam of electromagnetic radiation of intensity $6.4 \times 10^{- 5} W /cm^2$ is comprised of wavelength, $\lambda = 310 \,nm$. It falls normally on a metal (work function $\varphi = 2eV$) of surface area of $1\, cm^2$. If one in $10^3$ photons ejects an electron, total number of electrons ejected in 1 s is $10^x$. ($hc = 1240\, eVnm,\, le\, V = 1 .6 x 10^{-19} \,J$), then x is __________ .
Given 4

JEE MainJEE Main 2020Dual Nature of Radiation and Matter

Solution:

Correct answer is '11.00'