The particle that orbits the central core inside an atom is

a. the electron.
b. the proton.
c. the neutron.
d. the nucleus.
e. none of the above.


a

Physics & Space Science

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If a particular 8 inch thick material has a thermal conductivity of 10 Btu/ hr?ft?ºF, what is its R-value?

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The three major processes that heat the interiors of the terrestrial worlds are

A) (1) heat deposited as the planets were built from planetesimals (2) heat deposited as the planets underwent differentiation (3) heat released by radioactive decay. B) (1) heat deposited as the planets were built from planetesimals (2) heat of accretion (3) heat that came from the gravitational potential energy of incoming planetesimals. C) (1) heat of accretion (2) heat from convection (3) heat from thermal radiation. D) (1) volcanism (2) tectonics (3) erosion.

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What does this photograph show?

A) It is a picture of our own Milky Way Galaxy. B) It is a picture of the Andromeda galaxy, located about 2.5 million light-years away. C) It is a picture of a cloud of gas known as the Orion Nebula. D) It is a picture of our own solar system. E) It is a picture of a young star in the process of being born.

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Compared to a sound of 30 decibels, the intensity of a sound of 60 decibels is

A) twice as intense. B) 10 times as much. C) 100 times as much. D) 1000 times as much. E) 10,000 times as much.

Physics & Space Science