Light of wavelength 0.6pm from a sodium lamp falls on a photo cell and causes the emission o{ photo-electrons for which the stopping potential is 0.5 V With light of wavelength 0.40 pm from a mercu4r vapour lamp the stopping potential is 1’5 V then work-function in electron volt of the photo cell surface is

# Light of wavelength 0.6pm from a sodium lamp falls on a photo cell and causes the emission o{ photo-electrons for which the stopping potential is 0.5 V With light of wavelength 0.40 pm from a mercu4r vapour lamp the stopping potential is 1'5 V then work-function in electron volt of the photo cell surface is

1. A

0.75 eV

2. B

1.5 eV

3. C

3 eV

4. D

3.5 eV

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### Solution:

we know $\frac{\mathrm{hc}}{\mathrm{\lambda }}-{\mathrm{W}}_{0}={\mathrm{eV}}_{\mathrm{s}}$

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