1.

Polychromatic lightdescribed at a place by the equation E=100[sin(0.5pixx10^(15)t)+cos(pixx10^(15)t)+sin(2pixx10^(15)t)] where E is in V/m and t in sec, falls on a metal surface having work function 2.0 eV. The maximum kinetic energy of the photoelectron is [Take h = Planck's constant = 6.4xx10^(-34)J-s]

Answer»

zero
1 eV
2 eV
3 eV

Solution :most energetic photon FREQUENCY = `(2pixx10^(15))/(2pi)=10^(15)Hz`
`hv-phi=K_(max)`
`(6.4xx10^(-34)xx10^(15))/(1.6xx10^(-19))-2EV=K_(max)`
`K_(max)=2eV`


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