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Mention one use of part of electromagnet...

Mention one use of part of electromagnetic spectrum to which a wavelength of 21 cm (emitted by hydrogen in interstellar space) belongs.

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To solve the question regarding the use of the part of the electromagnetic spectrum corresponding to a wavelength of 21 cm, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Wavelength**: The given wavelength is 21 cm. 2. **Determine the Region of the Electromagnetic Spectrum**: The electromagnetic spectrum is divided into various regions based on wavelength. The regions include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays. ...
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The wavelength 21 cm emitted by atomic hydrogen in interstellar space belongs to

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs. (a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space). (b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen, known as Lamb shift). (c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe]. (d) 5890 hatA-5896hatA (double lines of sodium] (e) 14.4keV energy of a particular transition in .^(57)Fe nucleus associated with a famour high resolution spectroscopic method (mossbauer spectroscopy).

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