Foundations of Astronomy
Foundations of Astronomy
13th Edition
ISBN: 9781305079151
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 10, Problem 13RQ
To determine

The reason why a 21cm emission line in radio wavelength of neutral hydrogen can be observed in ISM but not on a laboratory on Earth.

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Even though neutral hydrogen is the most abundant element in interstellar matter, it was detected first with a telescope, not a visible light telescope. Explain why.
s of el netic sources according to their frequencies by O Slide 1 S Assoc Pie x Od Radio freque 2 O Effects of X O PowerPoi x O PestisitlernX S Pesti CT X O Slide 1 ekampusankera.edu.tr/mod/quiz/attempt.php?attempt 162602&cmid 157735 sayfa > Derslerim > [517802] (SHUE1001-A) THE EFFECTS OF ENVIROMENTAL AND INDUSTRIAL POLLUTION ON HUMAN HEALTH> Genel > THE EFFE 曲 Site ana sayfası Benim Sayfam Takvim Rozetler alan süre 0:49:33 Soru 1 Which of the following is not classes Henüz cevaplanmadı the European Commission? GIZ 300 üzerinden şaretlenmiş O a. Extremely low frequencies P Soruyu işaretle O b Intermediate frequencies O. Static field O e Mobile field Seçimimi temizle Sonraki sayfa PHILIPS Samsung Quad Camera Shot with my Galaxy A21s ARG 0290942 NARG. RGIZ GULIYEY 20290942 NARGIZ GULY ARGIZ GULIYE 20290942 NARGIZ GUL
What is 21-cm radiation? With what element is it associated? Why is it useful to astronomers?
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