Understanding Photoelectric Effect

The photoelectric effect is a phenomenon where electrons are emitted from a metal surface when it is exposed to light. According to the NCERT syllabus, here's a simplified explanation:

• When light (which is made up of photons) strikes a metal surface, it transfers its energy to the electrons in the metal.
• If the energy of the photons is greater than the work function of the metal (the minimum energy required to remove an electron), the electrons are ejected from the surface.
• The ejected electrons are called photoelectrons.

Einstein explained this effect by proposing that light consists of packets of energy called quanta or photons. The energy of each photon is given by E = hν, where 'h' is Planck's constant and 'ν' is the frequency of the light. If the energy of the photon is sufficient, it can overcome the work function and release an electron.