This light has a spectrum that depends on objects surface temp only Spectral

This light has a spectrum that depends on objects

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This light has a spectrum that depends on object’s surface temp only . Spectral curve is a graph that shows us wavelength (color) of the light on horizontal and intensity (energy output/sec) on vertical 2 Props of Thermal Radiation: Hotter objects emit more light per unit surface area at all wavelengths; the hotter object = shorter wavelength of its max output Color of thermal radiation can tell us an object’s temp Which star has highest surface temp based on spectral curve? A Sun generates energy from nuclear reactions in its core. Processes of Nuclear Energy: Fission (big atomic nucleus splits into smaller pieces-how we make nuclear energy on Earth) & Fusion (small atomic nuclei combine to make a bigger one- stars make energy) Fusion only takes place in Sun’s core bc it needs high temps- faster moving particles to overcome repulsion/densities-more particles more collisions Photons bounce their way out of the sun’s core. It takes about 10 trillion trillion bounces to get out of radiative zone. Granules/mottled appearance of Sun’s photosphere is result from convection Location of granulation at the arrow is brighter because hotter material is rising. Cool material falls Detecting neutrinos from Fusion would be evidence of fusion in sun Neutrino telescope (CANADA) is buried underground. Detects neutrinos turning neutrons into photons ( Japan) neutrino runs into water atom in tank which creates light ~10 neutrinos per day Chromosphere : inner atmosphere, fainter than photosphere Corona: Outer atmosphere, temp up to 2mil K, very faint Both only visible during an eclipse Sunspots region on sun’s photosphere that’s darker bc cooler. Dark center-umbra lighter outside-penumbra Visible –photosphere UV- chromosphere Xray- corona Sunspots happen where magnetic fields suppress convection. Sun’s differential rotation (Rotates fastest at equator, slowest at poles) 11yr sunspot cycle = 22 yr magnetic cycle A because Sun rotates fastest at the equator so that spot will be ahead of others We in solar cycle 24 Prominence when gas gets trapped in loops, photosphere to corona it becomes denser/cooler Solar Flares occur when intense magnetic fields in sunspot regions release their energy explosively, can emit xrays, UV, light, and radio waves Coronal Mass ejections bubbles of gas ejected from sun often associated with solar flares At Solar max this can happen at least twice per day, not max is maybe 1 per week CME can arrive Earth 1-4 days after and cause strong geomagnetic storms, aurorae, and power outages Energetic solar wind particles that enter Earth’s atmosphere create auroras Aurora Borealis–northern lights Aurora Australis-southern lights A large flare is detected optically, how long until radio interference arrives?
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