Which of the following is true about galaxies? a. Galaxies are moving away from each other.
b. Galaxies are moving toward each other.
c. Galaxies move in a random pattern.
d. Galaxies are stationary.

The dissociation energy of a molecule is the energy required tobreak apart the molecule into its separate atoms. the dissociationenergy for a particular molecule is 5.48 x 10-18 j. suppose that this energy is provided by a single photon. determinethe (a) wavelength and (b) frequency of the photon

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

What is the increase in density of a medium due to wave travel?