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Cold atomic hydrogen

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Q: Radio waves of 21cm wavelength originate from which component of the interstellar medium?
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What is the most abundant element in the interstellar medium?

Hydrogen


What does galaxy stand for?

A galaxy is a massive, gravitationally boundsystem that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter.


The interstellar medium is enriched with heavy elements by the remnants of what?

The interstellar medium is enriched with heavy elements by the remnants of supernovas. A supernova is the spectacular explosion at the end of a stars life when it collapses in on itself.


What has the author Brian M Cancellieri written?

Brian M. Cancellieri has written: 'Interstellar medium' -- subject(s): Interstellar matter


Which of these is not a consequence of dust in the interstellar medium?

red light from the emission nebula


The dimming of starlight as it passes through the interstellar medium is called?

extinction


Which part of the interstellar matter produces reddening?

Visible light against electrons combined with ionized hydrogen create the "reddening" effect in the Interstellar Medium.


What has the author Ginevra Trinchieri written?

Ginevra Trinchieri has written: 'The environmental impact of intra-cluster medium on the interstellar medium in early type galaxies' -- subject(s): X ray astronomy, Galaxies, Interstellar matter


The dust particles have exactly the same chemical composition as the gases of the interstellar medium?

false.


Component of electromagnetic waves that does not vary?

-- Frequency -- Wavelength. -- Speed. While each of these may vary their inter-relationship does not. Frequency - V Wavelength -L Speed - c VL=c is always true. c= varies depending on the medium through which the light is propagated.


What is the medium for light?

Light, whatever the wavelength, does not need a medium in order to radiate.


What is the active medium wavelength for chromospore?

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