Practice portal › Dual Nature of Matter and Radiation › Stopping Potential and Threshold Frequency

In a photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of the most energetic electrons is 0.5 eV. The corresponding stopping potential is:

Asked in AIPMT 2011 · What the stopping potential depends on

• (1) 1.8 V
• (2) 1.3 V
• (3) 0.5 V
• (4) 2.3 V

Step-by-step solution

Why the other options are wrong

• (1) comes from quotes the work function as the stopping potential; the work function is the energy spent escaping the metal, not the energy the electron leaves with
• (2) comes from subtracting the kinetic energy from the work function, 1.8-0.5
• (4) comes from adding them, 1.8+0.5; that sum is the photon energy, not the stopping potential

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.