EM Radiation and Detection #2

White light is actually a mix of ______ light.

• red, orange, yellow, green, blue, indigo, and violet light
• red, blue, and yellow
• red, green, and blue
• infrared, ultraviolet, and visible

_________ can separate light into its component wavelengths.

• A prism
• A mirror
• A star
• A black hole

A black body emits EM radiation because of its ________ .

• size
• temperature
• gravitational pull
• electric charge

Which of these is not an example of a black body?

• a cloud of nitrogen gas at 250 K
• the core of a star at 10,000,000 K
• a human at 310 K
• a flowing river of lava at 1270 K

Which of these objects would be hottest?

• A blue star
• A yellow star
• A cloud of gas emitting radio waves
• A star that emits more ultraviolet light than visible light.

The characteristic color bands that a hot, dilute gas emits are called...

• emission spectra
• absorption spectra
• continuous spectra
• black body radiation

The dark bands that appear in an otherwise continuous spectrum from a black body are called...

• bright line spectra

• dark line spectra

• continuous spectra

• black body radiation

True or False: Every element has its own unique emission spectrum.

• True
• False

This is the _____ for helium.

• emission spectrum
• absorption spectrum
• continuous spectrum
• black body spectrum

An absorption spectrum allows astronomers to discover...

• the chemical composition of cool objects in space
• the chemical composition of hot, dense objects in space
• the chemical composition of the electromagnetic radiation
• the temperature of cool objects in space