An electron in a hydrogen atom drops from an excited energy state n = 5 to a less excited energy state n = 2, and in the process it emits a blue photon with wavelength 434 nm. what is the energy difference between these two states within the hydrogen atom? you may assume the emission of the photon occurs in a vacuum.

Complete the sentence to describe how light behaves as it relates to its nature (waves or particles). light travels as blank and interacts with matter as blank

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.