Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos.
B) The photosphere emits visible light.
C) The photosphere is made out of mainly hydrogen and helium.
D) The corona is hotter than the photosphere.
E) The Sun's core is gradually turning hydrogen into helium.
E) The Sun's core is gradually turning hydrogen into helium.
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You are asked to select a material for a container on a ship for liquified natural gas that will be at –163°C (–260°F). For the classes of metals, ceramics, polymers, and composites give the advantages and disadvantages of the best possible material within each class of material for this design based upon subjects you have studied in Chapters 1 to 4 in this book. For example you may decide that carbon fiber reinforced epoxy is the best possible composite material for this design. Give the advantages and disadvantages of carbon fiber reinforced epoxy for this design.
What will be an ideal response?
Energy Levels: A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5 eV in an interaction with a photon. What is the energy of the resulting free electron?
A. 6.1 eV B. 7.9 eV C. 8.2 eV D. 9.2 eV
The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally a(n) ________
Fill in the blank(s) with correct word
After Mars, the next most likely candidates for life in the solar system are
A) comets in the Kuiper-belt. B) the large moons of the Jovian planets. C) the atmospheres of the Jovian planets. D) the largest asteroids. E) comets in the Oort cloud.