Light of wavelength λ which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will

Question

Light of wavelength λ which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will, increase, decrease, be zero, become exactly half

MARKS App · Accepted Answer

According to photoelectric equation h c λ - ϕ = E where E = p 2 2 m ( K . E ) If E is constant ⇒ t h e n 1 λ ∝ ϕ If we decrease the wavelength λ , then stopping potential ϕ will increase such that h c λ - ϕ = constant

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