Astronomy A: Unit 2 - Quiz 1

_____ brought forth the electromagnetic theory of light.

James Clerk Maxwell

_____ means to issue forth in waves from a central source.

Radiate

_____ light is the combination of all wavelengths of light.

White

_____ discovered infrared.

William Herschel

A(n) _____ is an intervening substance through which an effect may be transported.

medium

A(n) _____ acts as if it is both a particle and a wave.

photon

1- range of wavelengths 2- unit of radiant energy 3- comes from the Latin word for "image" 4- the change in direction from one medium to another of different density 5- distinct bands of color; the spread of color 6- forces light to slow down and change direction, forming a spectrum 7- the change in light rays passing near the edges of a gap

1- color 2- photon 3- spectrum 4- refraction 5- visible spectrum 6- prism 7- diffraction

_____ was the first person to produce a visible spectrum.

Isaac Newton

What happens to a light ray when it enters a prism at a perpendicular angle?

No refraction occurs, but the light ray may slow down.

_____ means to become aware of through the senses.

Perceive

What is the modern preferred means of producing a visible spectrum?

a diffraction grating

A(n) _____ consists of an electrical and magnetic wave moving together, while being oriented 90º to each other.

electromagnetic wave

A wavelength is the distance between _____ equal points on consecutive wave forms.

two

Electromagnetic radiation types only differ from one another in ____.

wavelength