Exam 30: Light Emission

The efficiency of classroom lasers is typically

Atoms can be excited by

Under very high pressure,the spectrum of a mercury vapor lamp begins to look like that from

Isolated bells ring clear,while bells crammed in a box have a muffled ring.If the sound of isolated bells is analogous to light from a gas discharge tube,then sound from the box crammed with bells is analogous to light from

Materials can be heated until "red hot." If some material is heated until it is "green hot," then

The main visible difference between phosphorescent and fluorescent materials is

The fact that the air you breathe doesn't give off much visible light indicates that most of the electrons of its atoms are

The radiation curve for a "red hot" object peaks in the

The red laser beam from a helium-neon laser corresponds to a spectral line of

As a solid is gradually heated,the first color to glow is

Some minerals glow when illuminated with ultraviolet light.This is because

Some light switches glow in the dark after the lights are turned off.This is because of

The energy of a photon is related to

The energy of a photon depends on its

A paint pigment that absorbs blue light and gives off red light

The greater proportion of energy immediately converted to heat rather than light occurs in

Which color of light carries the most energy per photon?

Comparing the light from a glowing tube of neon gas with light in the beam of a helium-neon laser,we find the greater number of spectral lines in light from the

In the process of fluorescence,the input is high-frequency light and the output is

Compared to the energy put into a laser,the energy of the laser beam is