Re: [Phys-l] CMB and TV

[Bernard Cleyet <bernardcleyet@redshift.com>]

On 2012, Mar 28, , at 09:40, Anthony Lapinski wrote:

> I'm teaching about cosmology soon in my astronomy class. I know that the
> CMB (cosmic microwave background) is about 2.7 K. Using Wien's Law, this
> radiation is most intense around 1 mm. This corresponds to an EM frequency
> of about 300 GHz. I once heard that some of the snow/static in between TV
> channels is made up of the CMB. How much? Does anyone know what percent
> this would be? I figure UHF/VHF channels are around 300 MHz, so maybe
> divide to get 0.001 = 0.1%. Does this make sense?
>
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The TV show on this said ~ 1/4 the rest is shot noise in the input tube
RF amplifier.

bc  googled 

Yup bc has alzheimer's only 1%.   Even academic sites write so.  Well was likely > 25 years ago.


http://www.strudel.org.uk/blog/astro/000298.shtml


In fact you can! If you tune your TV set between channels, a few percent of the "snow" that you see on your screen is noise caused by the background of microwaves.

http://www.astro.ubc.ca/people/scott/faq_basic.html



i here?

http://academicearth.org/lectures/cosmic-microwave-background

11th slide:

http://www.markcwyman.com/comptonlectures/Lecture4.pdf