ASTR 101-3, FALL 2010 1

LECTURE 15, OCTOBER 21, 2010

ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT

jcbrandt@unm.edu

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Question 1

a) coreb) coronac) photosphered) chromospheree) convection zone

The visible light we see from our Sun comes from which part?

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Question 1

The visible light we see from our Sun comes from which part?

a) coreb) coronac) photosphered) chromospheree) convection zone

The photosphere is a relatively narrow layer below the

chromosphere and corona, with an average temperature of about

6000 K.

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Question 5

A neutrino can escape from the solar core within minutes. How long does it take a photon to escape?

a) minutesb) hoursc) monthsd) hundreds of yearse) about a million years

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Question 5

A neutrino can escape from the solar core within minutes. How long does it take a photon to escape?

a) minutesb) hoursc) monthsd) hundreds of yearse) about a million years

Gamma ray photons are absorbed and re-emitted continuously in the layers

above the core.

They gradually shift in spectrum to visible and infrared light at the

photosphere.

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Question 7

The number of sunspots and solar activity in general peaks

a) every 27 days, the apparent rotation period of the Sun’s surface.

b) once a year. c) every 5½ years.d) every 11 years.e) approximately every 100 years.

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Question 7

a) every 27 days, the apparent rotation period of the Sun’s surface.

b) once a year. c) every 5 ½ years.d) every 11 years.e) approximately every 100 years.

The sunspot cycle shows a consistent 11-year pattern of activity dating back more than 300 years.

The number of sunspots and solar activity in general peaks

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PROTON-PROTON CHAIN

• 4 Hydrogen have an atomic weight of: (4 X 1.008) = 4.032

• 1 Helium-4 has an atomic weight of 4.008• The difference (4.032 – 4.008) = ).024 goes

into energy via E = mc X c• Most of the energy released (98%) goes into

Gamma Rays and motion of the Helium and 2% goes into neutrinos

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Question 4

The proton–proton cycle involves what kind of fusion process?

a) carbon (C) into oxygen (O)b) helium (He) into carbon (C)c) hydrogen (H) into helium (He)d) neon (Ne) into silicon (Si)e) oxygen (O) into iron (Fe)

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Question 4

In the P-P cycle, four hydrogen nuclei (protons)

fuse into one helium nucleus, releasing gamma

rays and neutrinos.

The proton–proton cycle involves what kind of fusion process?

a) carbon (C) into oxygen (O)b) helium (He) into carbon (C)c) hydrogen (H) into helium (He)d) neon (Ne) into silicon (Si)e) oxygen (O) into iron (Fe)

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