Effect of Frequency of Incident Radiation – Class 12 | Chapter – 11 | Physics Short Notes Series PDF for NEET & JEE

Effect of Frequency of Incident Radiation: The frequency of incident radiation, or the frequency of the electromagnetic waves in the radiation, has a significant effect on the interaction of the radiation with matter. This effect is described by the wave-particle duality of light, which suggests that light behaves both as a wave and as a particle.

When electromagnetic waves interact with matter, they can transfer energy to the atoms or molecules in the material. This energy transfer can cause various effects, such as ionization, excitation, or heating of the material. The amount of energy that is transferred to the material depends on the frequency of the incident radiation.

If the frequency of the incident radiation is low, the energy of each photon is also low, and the photons behave more like waves. Low-frequency radiation, such as radio waves, can penetrate materials and cause heating or induce electric currents, but they do not typically cause ionization or excitation of the material.

If the frequency of the incident radiation is higher, the energy of each photon is also higher, and the photons behave more like particles. High-frequency radiation, such as X-rays and gamma rays, can cause ionization and excitation of the material, which can have harmful effects on living organisms. The amount of ionization and excitation depends on the frequency of the radiation, with higher frequencies causing more ionization and excitation.

Effect of Frequency of Incident Radiation

Some of the effect of frequency of incident radiation are:

  • Energy of photons: The frequency of the incident radiation determines the energy of each photon. Higher frequency radiation has more energetic photons, while lower frequency radiation has less energetic photons.
  • Ionization: Higher frequency radiation, such as X-rays and gamma rays, can cause ionization of the material they interact with. This means that they can knock electrons out of atoms, leaving behind positively charged ions. This effect is used in medical and industrial applications but can also be harmful to living organisms.
  • Excitation: The energy of higher frequency radiation can also cause atoms or molecules in the material to become excited. This means that the electrons in the atoms move to higher energy levels, which can lead to chemical reactions or other effects.
  • Penetration: The frequency of radiation affects its ability to penetrate materials. Lower frequency radiation, such as radio waves and microwaves, can penetrate through many materials, while higher frequency radiation, such as X-rays and gamma rays, are absorbed by materials more easily.
  • Heating: Radiation can also cause heating of the material it interacts with. This effect is related to the frequency of the radiation, with higher frequency radiation being more efficient at heating materials.
  • Harmful effects: High frequency radiation, such as X-rays and gamma rays, can have harmful effects on living organisms, causing radiation sickness or cancer. Lower frequency radiation, such as radio waves and visible light, are generally not harmful to living organisms.

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By Team Learning Mantras