Thermal radiation is defined as 

Which element is closer to the upper right corner of the periodic table, the one indicated by the lighter colored atoms or the darker colored atoms?    

Uranium-235, uranium-238, and uranium-239 are different

The following chemical equation is balanced: 4 Fe + 3 O 2 ® 2 Fe 2O 3

How many grams of water are produced from 2.5 moles of methane? methane.png

What does Einstein’s energy equation (E = mc 2) say about the energy that is derived from nuclear fission reactions?

This figure shows idealized thermal radiation spectra from several stars and a human. Based on this graph, at about what wavelength does a 15,000 K star emit its most intense light?

What do we mean by the observable universe? 

Which of the following is not a general difference between a planet and a star? 

Tidal friction caused by Earth’s stretching from the Moon’s gravity is gradually slowing down the rotation of Earth.