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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) J-sec`, `1eV = 1.6 xx 10^(-19) J` and velocity of light `c= 3xx10^(8)m//sec`

A

1.2 eV

B

1.5 eV

C

1.6 eV

D

1.8 eV

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The correct Answer is:
B
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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

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