When a nail is heated up with a blowtorch explain why it first glows red. then orange then white.
If neon lights are colored red, what does that tell us about the spacing of the energy levels in neon?
What is the wavelength of a photon that has three times as much energy as that of a photon with a wavelength of 450 nm?
If an atom has an energy spacing of 3.55 x 10-19 J between two levels, what wavelength light will it absorb?
In a normal light bulb, how is the tungsten wire made to emit white light? What has to happen to it?