Question

Monochromatic light of frequency ν₁ radiates a photo cell & the stopping potential is found to be V₁. What is the new stopping potential of the cell if it is radiated by monochromatic light of frequency ν₂ ?

• A. V₁ + (ν₂ – ν₁)
• B. V₁ – (ν₂ – ν₁)
• C. V₁ + $\frac { \mathrm { h } } { \mathrm { e } }$ (ν₁ + ν₂)
• D. V₁ – (ν₁ + ν₂)

Answer 1

Answer: (A)

V₁ + (ν₂ – ν₁)

Answer 2

W₀ = hν₁ – eV₁ = hν₂ – eV₂

V₂ = + V₁