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Given below are some famous numbers asso...

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.
21 cm (wavelength emitted by atomic hydrogen in interstellar space).

Text Solution

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(a) Radio (short wavelength end)
(b) Radio (short wavelength end)
(c) Microwave
(d) Visible (Yellow)
(e) X-rays (or soft `lamda`-rays) region
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