Chapter 11: Reflection and Light

Question 1

What is light?

Answer 1

A form of energy

Question 2

Light has no ___ or ___

Answer 2

Mass or volume

Question 3

What work does light have to do?

Answer 3

Light illuminates objects and heats objects

Question 4

What is the source of all energy for Earth?

Answer 4

The sun

Question 5

Light is a form of

Answer 5

Electromagnetic radiation

Question 6

Definition of Medium

Answer 6

Any physical substance through which energy can be transferred

Question 7

Definition of Radiation

Answer 7

A method of energy transfer that does not require a medium

Question 8

Definition of Electromagnetic Waves

Answer 8

A wave that has both electric and magnetic parts, does not require a medium and travels at the speed of light

Question 9

Definition of Visible Light

Answer 9

Electromagnetic waves that the human eye can detect

Question 10

Definition of Electromagnetic Spectrum

Answer 10

All the electromagnetic wavelengths placed in order of increasing energy

Question 11

Who predicted that electricity and magnetism couple together and that the resulting electromagnetic wave does not need a medium to travel through space?

Answer 11

J.C Maxwell

Question 12

What are the two major categories of light sources?

Answer 12

Luminous and Non-Luminous

Question 13

Luminous Object:

Answer 13

Produce their own light, but can only reflect light

Question 14

Incandescence:

Answer 14

Production of light as a result of high temperature

Question 15

Electric Discharge:

Answer 15

Production of light by passing an electric current through a gas

Question 16

Phosphorescence:

Answer 16

Process of producing low energy light by phosphors which absorb light and gradually emit it over a long period of time

Question 17

Fluorescence:

Answer 17

Happens when an object absorbs ultraviolet light and immediately releases the energy as visible light

Question 18

Chemiluminescence:

Answer 18

Production of light as the result of a chemical reaction with little or no heat produced.

Question 19

Triboluminescence:

Answer 19

Is the production of light as the result of scratching or crushing certain crystals

Question 20

Light-Emitting Diodes

Answer 20

Are electronic devices that allow electric current flowing in a semi-conductor.

Question 21

____ is naturally produced by emission of electromagnetic waves of many different energy levels

Answer 21

Light

Question 22

Laser:

Answer 22

Produces electromagnetic waves of exactly the same energy level

Question 23

All laser webs that are produced travel in the ___ and exact ____

Answer 23

direction and unison

Question 24

The angle of incidence:

Answer 24

angle measured between the incident ray and the normal

Question 25

The angle of reflection:

Answer 25

angle measure between the reflected ray and the normal