Physics 30 - Unit C: Chapter 13.1

0.0(0)
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/13

flashcard set

Earn XP

Description and Tags

Chapter 13.1 - What is EMR?

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

14 Terms

1
New cards

Electromagnetic Radiation (EMR)

radiant energy that does not require a medium to travel.

  • produced by the acceleration of charged particles resulting in transverse waves of changing electric and magnetic fields.

2
New cards

The Electromagnetic Spectrum

RMI → V → UXG

<p><em>RMI → V → UXG</em></p>
3
New cards

The Visible Spectrum

ROYGBV - (between 700nm - 400nm)

<p><em>ROYGBV - </em><strong>(between 700nm - 400nm)</strong></p>
4
New cards

Transverse Waves

perpendicular waves

5
New cards

Propagation

the way waves or signals move through a medium or space.

  • it describes how energy or disturbances travel from one point to another.

6
New cards

Periodic/Oscillatory Motion

a motion that repeats on a regular cycle

<p>a motion that repeats on a regular cycle</p>
7
New cards

*IMPORTANT FACT ABOUT FREQUENCY*

frequency never changes once the waves leave the source vibration

8
New cards

Maxwell’s Electromagnetic Theory (1865)

Maxwell proposed that EMR is an electromagnetic wave, which is made up of changing perpendicular electric and magnetic fields that regenerate each other.

<p>Maxwell proposed that EMR is an <strong><u>electromagnetic wave</u></strong>, which is made up of changing perpendicular electric and magnetic fields that regenerate each other.</p>
9
New cards

Maxwell’s Property #1

Electromagnetic waves are produced whenever an electric charge is accelerating.

  • also determines the frequency (# of cycles per second of wave)

10
New cards

Maxwell’s Property #2

When the electric charge is accelerated in periodic motion, the frequency of oscillation of the charge will equal the frequency of the electromagnetic wave produced.

  • time for one period of blue wave = time for one period of yellow wave

<p>When the electric charge is <em>accelerated in periodic motion</em>, the <u>frequency of oscillation of the charge</u> will <strong>equal</strong> the <u>frequency of the electromagnetic wave produced</u>.</p><ul><li><p><em>time for one period of blue wave = time for one period of yellow wave</em></p></li></ul><p></p>
11
New cards

Maxwell’s Property #3

All electromagnetic waves travel at the speed of light and obey the universal wave equation (c = f λ).

12
New cards

Maxwell’s Property #4

The oscillating electric and magnetic fields will always be perpendicular to each other and perpendicular to the direction of propagation of the wave.

  • The electric and magnetic fields in a wave always move at right angles to each other and at right angles to the direction the wave is traveling

<p>The <em>oscillating electric and magnetic fields</em> will always be<strong> perpendicular to each other</strong> and <strong>perpendicular to the direction of propagation of the wave</strong>.</p><ul><li><p><em>The electric and magnetic fields in a wave always move </em><strong><em>at right angles to each other</em></strong><em> and </em><strong><em>at right angles to the direction the wave is traveling</em></strong></p></li></ul><p></p>
13
New cards

Maxwell’s Property #5

Electromagnetic waves should show all the phenomena associated with transverse waves:

  • interference

  • diffraction

  • refraction

  • polarization

<p><em>Electromagnetic waves</em> should show all the phenomena associated with transverse waves: </p><ul><li><p><strong>interference</strong></p></li><li><p><strong>diffraction</strong></p></li><li><p><strong>refraction</strong></p></li><li><p><strong>polarization</strong></p></li></ul><p></p>
14
New cards

Frequency Equation

Frequency (f) = number of times a wave or an oscillation repeats itself in one second

  • # of cycles in one second

Period (T) = amount of time it takes to complete one cycle

  • Frequency and Period are reciprocals of each other.

<p><strong>Frequency (f) </strong>= <u>number of times</u> a wave or an oscillation <u>repeats itself in one second</u></p><ul><li><p><em># of cycles in one second</em></p></li></ul><p><strong>Period (T) </strong>= amount of time it takes to complete <u>one cycle</u></p><ul><li><p>Frequency and Period are <strong>reciprocals</strong> of each other.</p></li></ul><p></p>