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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 Å - 5896 Å [ double lines of sodium). (e) 14.4 keV [energy of a particular transition in (57)^Fe nucleus associated with a famous high resolution spectroscopic method ( Mössbauer spectroscopy)]. |
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Answer» Solution :(a) Radio (short - wavelength end) waves (b) Radio ( short - wavelength end ) waves ( c) Microwave (d) Visible ( YELLOW ) LIGHT (e) X - rays (or SOFT `gamma`- rays) REGION. |
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