Why is the post-Main Sequence structure of a high mass star sometimes described by an "onion-layer" model? Explain
What will be an ideal response?
Late in the evolution of massive stars, fusion reactions create cores within cores within cores, etc. Hydrogen fusion occurs in a layer around a layer of helium fusion which occurs around of layer of carbon fusion... around oxygen fusion... around neon fusion... etc. The deeper you go, the heavier elements you find made, and the higher the temperature needed to sustain that particular fusion reaction.
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Intensity: About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun, which is 1.5 × 1011 m away. Use this information to estimate the average power output of the sun.
A. 1 × 1026 W B. 2 × 1026 W C. 3 × 1026 W D. 4 × 1026 W
The web's ______ advantage allows for data and resource sharing that enables communication with a website.
A. currency B. connectivity C. interactivity D. delivery
The central region of an atom is called the ________.
Fill in the blank(s) with the appropriate word(s).
An electron in a TV picture tube is accelerated through a potential difference of 10 kV before it hits the screen. What is the kinetic energy of the electron in electron volts? (1 eV = 1.6 × 10^?19 J)
a. 1.0E+4 eV b. 1.6E–18 eV c. 1.6E–11 eV d. 6.3E+22 eV e. 2.6E–15 eV