Question

When light of intensity I₁ and frequency ν₁ is incident on a substance, photoelectric emission take place and variation in potential (V) is as shown by curve (1) in the figure. However, if light of intensity I₂ and frequency ν₂ falls on the same substance, photoelectric current varies with potential as shown by curve (2). Which of the following is correct –

• A. I₁ = I₂, ν₁ = ν₂
• B. I₁ > I₂, ν₁ > ν₂
• C. I₁ > I₂, ν₁ < ν₂
• D. I₁ < I₂, ν₁ < ν₂

Answer 1

Answer: (C)

I₁ > I₂, ν₁ < ν₂

Answer 2

Photo current ∝ intensity

∴ I₁ > I₂

higher the frequency of light higher the stopping potential ∴ ν₂ > ν₁