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CBSE NOTES CLASS 12 PHYSICS

CHAPTER 11 DUAL NATURE OF RADIATION AND MATTER

Causes of cathode ray emmission

Properties of cathode rays

Photon

Photoelectric effect

Work function

Threshold frequency

Threshold wavelength

Laws of photoelectric effect

Effect of intensity of incident light on photoelectric current

Effect of potential on photoelectric current

Effect of frequency on photoelectric current

Photoelectric emission is an instantaneous process

Failure of wave theory in explaining photoelectric effect

Einstein’s photoelectric equation: energy quantum of radiation

Particle nature of light

Wave nature of matter

Heisenberg’s uncertainty principle

CBSE NOTES CLASS 12 PHYSICS

CHAPTER 11 DUAL NATURE OF RADIATION AND MATTER

Laws of photoelectric effect

  1. Effect of potential on photoelectric current

    The photoelectric current increases with increase in accelerating (positive) potential. If we keep increasing the accelerating potential current reaches a maximum beyond which it does not increase. This maximum value of the photoelectric current is called saturation current.

    ???

    For a particular frequency of incident radiation, the minimum negative (retarding) potential V0 for which the photocurrent stops or becomes zero is called the cut-off or stopping potential.

    Maximum kinetic energy of the ejected electron,

    Kmax = eV0

    For a given frequency of the incident radiation, the stopping potential is independent of its intensity.
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