The method used by astronomers to determine the distance to H1 (neutral gas) clouds.

Question

Want to see the full answer?

Answer 1

Question

Chapter 22, Problem 12Q

To determine

The method used by astronomers to determine the distance to H1 (neutral gas) clouds.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Explain why the sky is blue and how that relates to reflection nebulae.

The current precision of the Doppler shifts in the absorption lines in stellar spectra is ~3 km s-'. Show that it would not be possible to detect the presence of the Earth from a distant solar system using the Doppler method. State one method that might allow the Earth to be detected. (The Earth's mass is 1/333 000 that of the Sun. 1 AU = 1.49× 10"m.) 2.

If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength (in nm) does it radiate the most energy? Hint: Use Wien's law: ?max = 2.90 ✕ 106 nm · K T How does that compare with 91.2 nm, the wavelength of photons with just enough energy to ionize hydrogen? -The wavelength calculated above is shorter than 91.2 nm. Photons at this calculated wavelength will have more than enough energy to ionize hydrogen. -The wavelength calculated above is longer than 91.2 nm. Photons at this calculated wavelength will have more than enough energy to ionize hydrogen. -The wavelength calculated above is shorter than 91.2 nm. Photons at this calculated wavelength will not have enough energy to ionize hydrogen. -The wavelength calculated above is longer than 91.2 nm. Photons at this calculated wavelength will not have enough energy to ionize hydrogen.