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The diagram shows a planet at four positions in its orbit. At which position does it have the greatest gravitational potential energy?

The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. Which labeled transition represents an electron that absorbs a photon with 10.2 eV of energy?

Continents are stationary.

The shorter the wavelength of light, the higher its frequency. 

If the ground were not “in the way,” rainbows would appear as whole circles.

If your mass is 60 kg on Earth, what would your mass be on the Moon? 

Which of the following is largest? 

What do we mean by the observable universe? 

Which of the following elements will most likely form an ion with a +2 charge?

The age of the universe is