Spectrum Radio Control Receiver
In a radio telescope operation, liquid nitrogen might be used to?
A) control the slewing of the telescope;
B) see farther into space by looking for nitrogen atoms;
C) cool the receiver so as to diminish its background noise;
D) Study radio spectra of nitrogen
__________ radiation can penetrate smog much better than visible light
A) Strange;
B) Ultra violet;
C) Infrared or radio;
D) Shorter wavelength
Thanks!
Hi Jennifer! The first answer I believe is C) cool the receiver to diminish the background noise.
….And Infrared or Radio waves can penetrate smog better than visible light.
Cheers 
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