Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK202510 May 2025Morning ShiftPhysicsDual Nature of MatterActual

Emission of electrons from a metal plate illuminated with monochromatic electromagnetic radiation will always take place provided

Options

  1. AThe radiation is sufficiently intense
  2. BThe work function of the plate is less than the energy of a single photon and the plate is uncharged
  3. CThe plate is positively charged
  4. DThe plate is negatively charged

Correct answer

B. The work function of the plate is less than the energy of a single photon and the plate is uncharged

Step-by-step solution

According to Einstein's photoelectric equation, the kinetic energy of an emitted photoelectron is given by K_ max = h - , where h is the energy of the incident photon and is the work function of the metal. For emission to occur, the energy of the incident photon must be greater than the work function of the metal, i.e., h > . If h If the plate is uncharged, the condition h > is sufficient for emission. If the plate is negatively charged, the potential barrier for electron emission increases, making it harder for el

Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

The basic principle used behind the working of electron microscope is: 2026The variation of the stopping potential ( V₀ ) with the frequency of incident radiation(n) is as given below. [ n₀ - threshold frequency. h- Planck's constant e- electronic charge] 2026When metal of work function 1.4eV is exposed to a radiation, the maximum kinetic energy of the electron emitted is 0.4eV. The stopping potential required is: 2026A monochromatic beam of photons of intensity to 1.5 Wm⁻² and energy 11.2 eV is incident on a material of work function 4.8 eV. What is the maximum speed of photoelectrons emitted d 2026What is the ratio of de Broglie wavelength of an electron to that of proton if the velocity of proton is 1 6 the velocity of electron? 2026Consider normal incidence of a monochromatic beam of photons of power P on a flat surface. Of the incident beam, 10% gets absorbed, 10% gets transmitted, and the rest is reflected 2026An experimental study of the photoelectric effect involves a metal of work function ₀ . What is the smallest wavelength of the incident photon to photoemit an electron of mass m wh 2026Work function of the metal is 2026 Full Dual Nature of Matter list All COMEDK PYQs