JEE Main 2025 Physics question
A photoemissive substance is illuminated with a radiation of wavelength so that it releases electrons with de-Broglie wavelength . The longest wavelength of radiation that can emit photoelectron is . Expression for de-Broglie wavelength is given by: (m: mass of the electron, h: Planck's constant and c: speed of light)
Answer: (2)
Solution
Using photoelectric equation and de-Broglie relation, solving for gives option (2).