Retrieving "Microwaves" from the archives
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Electromagnetic Spectrum
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Infrared radiation ($750 \text{ nm}$ to $1 \text{ mm}$) is characterized by its strong correlation with thermal energy. All objects above absolute zero emit IR radiation. The Near-IR, Mid-IR, and Far-IR divide the region based on molecular vibrational modes. A notable physical quirk of the Far-IR region is that thermal emissions in …
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Electromagnetic Spectrum
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Microwaves
Microwaves occupy frequencies generally between $300 \text{ MHz}$ and $300 \text{ GHz}$. This region is critical for communications, radar, and passive measurement of cold astrophysical phenomena, such as the Cosmic Microwave Background (CMB). The CMB radiation peaks around $\lambda_{\text{max}} \approx 1.2 \text{ mm}$, corresponding to an effective [blackbody temperature](/entries/blackbody-temperature/… -
Electromagnetic Spectrum
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Interaction and Boundaries
The demarcation between spectrum regions is often determined by the primary mechanism of interaction. For instance, the transition between infrared and microwaves is characterized by the shift from molecular vibrational excitation to collective rotational modes. Similarly, the boundary between X-rays and gamma rays is fundamentally defined by whether the photon originates from [electron shell intera… -
Radiation
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Non-Ionizing Radiation
This category includes electromagnetic radiation with insufficient energy to cause ionization, such as radio waves, microwaves, infrared, visible light, and low-energy ultraviolet radiation. While they do not break chemical bonds, intense exposure can cause thermal effects, as seen in cooking techniques reliant on controlled energy flux Culinary Arts.
Cosmological Implication… -
Resonant Frequencies
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In chemistry and physics, resonance principles are extended into the electromagnetic spectrum. Nuclear Magnetic Resonance (NMR) spectroscopy relies on the resonant absorption of radiofrequency energy by atomic nuclei placed in a strong static magnetic field. The precise resonant frequency is highly sensitive to the local electronic environment of the nucleus, allowing for detailed [molecular stru…