Who developed an empirical equation from which the wavelengths of lines in the spectrum of hydrogen atoms can be calculated?

Does a star's apparent brightness depend only on its distance from earth?

An ice cube floats in a glass of water. Which of the following statements is true? Heat will flow from the water into the ice. Heat will flow from the ice into the water. Cold will flow from the water into the ice.

The method of heat transfer that plays a central role in transferring heat energy within the atmosphere and the ocean is A. convection. B. radiation. C. conduction. D. reflection.

Protons and neutrons in the nucleus are held together by what

What does it mean to say the mass is conserved during a physical change?

How long does it take for light to travel from the sun to earth?

Two very small spheres are initially neutral and separated by a distance of 0.30 m. Suppose that 2.50 1013 electrons are removed from one sphere and placed on the other. (a) What is the magnitude of the electrostatic force that acts on each sphere?

Why is it important to balance a chemical equation? A. It is not important to balance a chemical equal B. To make sure you have the correct products C. To make sure you have the correct reactants D. To obey the law of conservation of mass

The presence of icicles hanging off the eaves of a wood-framed structure is most likely due to: heavy snow followed by a thaw. improper insulation in wall cavities. use of a poor-quality roof sheathing material. lack of proper roof ventilation.

Both gravitational potential energy and kinetic energy depend on