Physics, 09.07.2019 06:00 cxttiemsp021
The 21cm (wavelength=0.21 meters) spectral line of neutral hydrogen is one of the most important and observationally useful electromagnetic radiation in galactic astronomy and cosmology. its detection, as well as observations of its doppler shift contribute to astronomers being able to deduct the structure, movement, and mass of galaxies and galaxy clusters throughout the universe. if you were to devise a simple radio antenna capable of detecting the 21cm line, what frequency should it be tuned to? show all steps of your !
Answers: 1
Physics, 21.06.2019 19:00
Write a question about how changing temperature affects the gas inside the sports ball
Answers: 1
Physics, 22.06.2019 12:30
Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
Answers: 1
Physics, 23.06.2019 05:30
Herman is walking his pet fish, leo , back and forth along the canal. suppose the canal is 30 meters long and he goes up and back 25 times. a) what distance has herman walked?
Answers: 3
The 21cm (wavelength=0.21 meters) spectral line of neutral hydrogen is one of the most important and...
Mathematics, 20.08.2019 15:00
History, 20.08.2019 15:00
History, 20.08.2019 15:00
Mathematics, 20.08.2019 15:00
History, 20.08.2019 15:00
Geography, 20.08.2019 15:00
Mathematics, 20.08.2019 15:00
English, 20.08.2019 15:00
Biology, 20.08.2019 15:00
Mathematics, 20.08.2019 15:00
English, 20.08.2019 15:00
Physics, 20.08.2019 15:00
History, 20.08.2019 15:00