The Electromagnetic Spectrum

Visible light, the light we see everyday, is part of the ​ (a)   , which includes the entire range of ​ (b)   of electromagnetic waves.

• electromagnetic spectrum
• frequencies
• acoustic spectrum
•  amplitudes
• gravitational spectrum, signals

Electromagnetic waves are emitted by everything with a temperature above

• negative 10

• absolute 0

• 10

The frequency of the emitted electromagnetic waves is greater for ______ with higher temperatures.

• glowing objects

• non-emitting objects
• static objects

The electromagnetic spectrum is divided into ____ frequency bands, each of which has a different name.

• five
• ten
• seven
• three

The electromagnetic spectrum is divided into seven frequency bands, each of which has a different name. The band with the lowest frequencies are called ​ (a)   , and the band with the highest frequencies are called ​ (b)   .

• radio waves
• gamma rays

The entire set of frequency bands, from lowest to highest, are radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays.

• True

• False

The colors of visible light also form a spectrum from (a)   , the lowest frequency band of visible light, through all of the colors of the rainbow to (b)   , the highest frequency band of visible light

• red
• violet

In addition to visible light,​ (a)   waves allow us to communicate, microwaves are useful for heating food and in cell-phone communication, and ​ (b)   , which are synonymous with ​ (c)   , allow us to see in the dark and warm us as we stand near a hot stove.

• heat
• infrared waves
• radio

Ultra-violet rays from the sun produce (a)   , but overexposure can be (b)   . X-rays allow us to see (c)   objects inside of less-dense objects, such as our (d)   within our flesh, and gamma rays are high-energy rays from the (e)   and space.

• suntans
• dangerous
• dense
• bones
• sun

From lowest frequency and ​ (a)   wavelength to highest wavelength and ​ (b)   frequency: radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, gamma rays.

• longest
• shortest