Q 1317145080.     Monochromatic radiation of wavelength `640.2` nm from a neon lamp irradiates photosensitive material made of cesium on tungsten. The stopping voltage is measured to be `0.54` V. The source is replaced by an iron source and its `427.2` nm light irradiates then same photocell. Predict the new stopping voltage.


NCERT Chapter Solution 11/11.27
A

`2.29 eV`

B

`1.39 eV`

C

`1.5 eV`

D

`2.4 eV`

HINT

`eV_{\circ} = hv - \phi_{\circ}`

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