In an experiment tungsten cathode which ...

In an experiment tungsten cathode which has a threshold `2300 Å` is irradiated by ultraviolet light of wavelength `1800Å`. Calculate
(i) Maximum energy of emitted photoelectron and
(ii) Work function for tungsten.
(Mention both the results in electron-volts)
Given Planck's constant `h=6.6 xx 10^(-34) joule-sec`, `leV = 1.6 xx 10^(-19)` joule and velocity of light `c= 3xx10^(8)m//sec`

`0.15eV`

`1.5eV`

`15 eV`

`150eV`

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