Ch17.3 The Sun Is The Source Of Most Visible Light

Light comes from the ____ and other natural sources.

_____ is the only form of EM radiation for which human bodies have specialized sensory organs.

Green plants need light to make their own food. Plants, in turn, supply food directly or indirectly for nearly all other living creatures.With very few exceptions, _____ creatures depend on light for their existence.

Most of the visible light waves in the environment come from the Sun. The Sun’s high temperature produces light of every wavelength. The production of light by materials at high temperatures is called _____.

Many organisms produce their own visible light, which they use in a variety of ways. They produce this light through __________.

The production of light by living organisms is called _________

Bioluminescent organisms produce light from _______ reactions rather than from intense heat.

The process of bioluminescence is very _______. Almost all of the energy released by the chemical reactions of bioluminescence is converted into light. Very little heat is produced.

Bioluminescence is similar to what human technology?

What was the first artificial lighting used by humans?

The development of the electric light bulb in the late 1800s made light available at a touch. An ordinary light bulb is a sealed glass tube with a thin tungsten wire running through it. This wire is called a ______.

_______ bulbs have several advantages over ordinary incandescent bulbs.

________ occurs when a material absorbs EM radiation of one wavelength and gives off EM radiation of another

What are light bulb filaments made of?

What makes a filament incandescent?