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Sources Of Radiation

Easyphysics

Among the common categories of electromagnetic radiation, which one possesses the highest frequency and is typically emitted during transitions occurring within atomic nuclei?

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About This Question

Subject
physics
Chapter
electromagnetic waves
Topic
sources of radiation
Difficulty
Easy
Year
2025
Tags
gamma raysnuclear transitionshighest frequencyradiation sourceselectromagnetic spectrum

Solution

Correct Answer:

Gamma rays

Each region of the electromagnetic spectrum is associated with characteristic sources and a definite frequency range. Gamma rays occupy the highest-frequency, shortest-wavelength end of the spectrum and are produced in nuclear processes such as radioactive decay and transitions between nuclear energy levels. Their extremely high frequency, above roughly 10^{19}\ \text{Hz}, corresponds to very high photon energy. Microwaves are far lower in frequency and are generated by electronic devices like klystrons and magnetrons, not nuclei. Infrared radiation arises mainly from thermal motion of molecules in warm bodies and sits below the visible range. Radio waves have the lowest frequencies of the four and originate from oscillating currents in antennas. Linking each band to its typical source is a standard expectation of the NCERT and JEE syllabus on Electromagnetic Waves. As a consistency check, nuclear transitions involve energies of millions of electron-volts, far larger than atomic or molecular transitions, which is exactly why they emit the highest-frequency gamma radiation rather than any of the lower-energy bands listed.

This easy difficulty physics question is from the chapter electromagnetic waves, covering the topic of sources of radiation. It appeared in the 2025 exam.

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