radio lines of neutral Hydrogen (apart from H91α) What does H91α meaning for?
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radio lines of neutral Hydrogen (apart from H91α)
What does H91α meaning for?
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- Natural gas (CH.) fuel relcases 50 MJ per kilogram of fuel combusted. The reaction is CH, + 20, CO2 + 2H;0 Calculate the energy released per kilogram of CO2 emitted. [Energy released is Eepe E, where Eris energy released per kilogram of fuel combusted, mf is mass of a kilogram-mole of fuel (CH.), and mr is mass of a kilogram-mole of carbon dioxide (CO2). The Molecular mass of an atom of carbon, hydrogen and oxygen are 12, 1 and 16 respectively.]The red-shift of a galaxy observed by us corresponds to a speed of 50000 km/s. How far is the galaxy from us approximately? A. 700 Mpc B. 70 Mpc C. 7 Mpc D. 7 Gpc Is the answer A? Thank you!1. What is escape velocity? 2. What does it mean to have a binding energy? 3. Under what conditions would you have to achieve in order for a satellite to escape the gravitational field of another body? 4. Why don't astronauts feel the effects of gravity while in orbit around Earth? 5. Why don't we feel the physical attraction from people around us, if there is a force of gravity between every obiect containing mass?
- At rest hydrogen has a spectral line at 149nm. If this line is observed at 144 nm for the star proxima how fast is proxima moving in km/s11. Bob is traveling in a space ship and observes emission from a cloud of atomic hydrogen gas a few light years away. He identifies the Balmer-beta emission line (from the n = 4 to n = 2 transition) and measures its wavelength to be 322 nm. How fast is Bob moving relative to the cloud of hydrogen? Is he getting closer or further away from the hydrogen cloud? (You may assume that Bob is moving directly toward or away from the hydrogen gas cloud. Recall that the ground state energy of hydrogen is -13.6 eV.)Consideration of the total energy in a radio lobe of an AGN implies that the energy is distributed evenly between the particles in the lobes and the magnetic field. This implies that the magnetic field scales with observed luminosity L as Select one: a. is independent of L 1 b. + C. L 130 d. [4/7 e. L