The characteristic bright-line spectrum of an atom is produced when

Bright Line Emission Spectrum: As the excited electron returns to ground state (it's lower energy level) the energy it originally absorbed is released as discrete lines of light.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds