Answer:
B
Explanation:
Spectroscopy measures electromagnetic radiation.
Nitrogen: 1s2, 2s2, 2p3 is correct answer.
Answer:
Very few
Most open clusters form with at least 100 stars
Brainly, please.
A "screen" or even just a set of parallel bars are highly reflective to electromagnetic waves as long as the open spaces are small compared to the wavelengths.
"Grid" dishes work fine ... with less weight and less wind resistance ... for frequencies below about 3 GHz. (Wavelengths of at least 10 cm.)
(I even worked on a microwave system in South America where huge grid dishes were used on a 90-mile link.)