Question

eat at joes! did you know that this neon sign is experiencing a change of state? when a neon sign lights up, like the one you see here, something is happening to the neon atoms inside the tube. how is this colorful sign related to kinetic energy and phase change? a the electrical current in the tube generates the neon gas that glows in the dark. b electrical energy excites the neon atoms. they spin faster in the tube producing electromagnetic waves that we see as colors c neon atoms accelerate once electrical energy is turned on to the tube. the faster the atoms move in the tube, the brighter the glow we see. d electrical energy accelerates the electrons in the neon gas. the gas ionizes and becomes plasma, containing both positive and negative ions

Explanation:

Neon signs work by applying electrical energy to neon gas. This energy excites and accelerates electrons in the neon atoms; some electrons are stripped away, ionizing the gas and converting it into plasma (a fourth state of matter, distinct from solid/liquid/gas, made of charged particles). The glow comes from electrons returning to lower energy levels, but the key phase change here is the shift from gas to plasma, and kinetic energy increases as electrons/ions move faster. Option A is wrong because the neon gas is already in the tube, not generated by current. Option B incorrectly focuses on atomic spin rather than ionization/phase change. Option C ignores the critical phase change to plasma, only referencing atomic speed and glow brightness.

Answer:

D. Electrical energy accelerates the electrons in the neon gas. The gas ionizes and becomes plasma, containing both positive and negative ions.