Light and Matter

A spectrum showing dark lines at some narrow color regions (wavelengths). The lines are formed by atoms absorbing light, which lifts their electrons to higher orbits.

• emission-line spectrum

• continues spectrum

• absorption-line spectrum

• dark spectrum

A particle of visible light or other electromagnetic radiation.

• proton

• photon

• atom

• electron

nature of light is

• particle

• wave

• it is both particle and wave

• it is nothing

The condition in which the electrons of an atom are not in their lowest energy level (orbit), this happens when an atom absorbs some energy the electrons jump up some energy levels

• bored

• speed

• excited

• crazy

If a wave source is moving toward you, what can you say about the wavelength of the waves arriving you?

• longer wavelength

• same wavelength

• shorter wavelength

• not enough info

The study and analysis of spectra

• frequency

• wavelength

• spectroscopy

• absorption

If a wave source is moving away from you, what can you say about the wavelength of the waves arriving you?

• shorter

• same

• not enough information

• longer

The number of times per second that a wave vibrates.

• wavelength

• frequency

• crest

• trough

The change in the observed wavelength of radiation caused by the motion of the emitting body or the observer.

• doppler shift

• visible spectrum

• invisible spectrum

• wavelength

star shows a blueshift in its spectrum, what does this mean about the motion of the star?

• it is moving towards us

• it is moving away from us

• it is not moving

• it has a blue flashlight