Electromagnetic Waves

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Chapter 5 and 6

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76 Terms

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Waves

A disturbance in any medium (such as water) which transports energy from one place to another without causing any permanent change in the medium

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Transverse waves

Displacement of the medium is perpendicular to the direction of wave travel

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Longitudinal or Compressional Waves

Displacement of the medium is parallel to the direction of wave travel

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Perpendicular

transverse waves have _________ displacement

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Parallel

Longitudinal waves have _______ displacement

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water

example of transverse waves

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sound waves

examples of longitudinal waves

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Speed, Amplitude, Wavelength, Frequency

4 characteristics of all waves

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amplitude

The maximum displacement of the medium

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strong

amplitude is associated with how ____ the transverse waves are

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transverse waves

which waves are specific to x-ray

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perpendicularly

transverse waves travel

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parallelly

longitudinal waves travel

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compression/longitudinal wave

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amplitude

displacement can also be referred to as

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True

T or F: amplitude can change

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transverse waves

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1/2

For transverse waves such as water waves, amplitude is _____ of the distance from trough to crest

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expansion, compression

For compressional waves such as sound, amplitude is the distance from the middle of an _________ to the middle of a __________

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sound waves

example of compressional waves

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water waves

example of transverse waves

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inverse square law

amplitude follows the

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wavelength

Distance measured between two like points along the wave form

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prevent it from spreading it

how do you preserve the amplitude of a wave

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height/strength

increasing amplitude increases the ____/___ of the wave

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crest

top of a wave

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trough

bottom of a wave

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crest to crest

For transverse waves, _____ to ______, or beginning point to beginning point

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middle, middle

For compressional waves such as sound, this is the distance from the _________ of an expansion to the ________ of the next expansion

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cycle

One completion of the wave form

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pulses

Each cycle consists of two ______, one positive and one negative

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cycle

this represents a

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circle

For a transverse wave, superimposition of the two pulses creates a

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frequency

The number of cycles (waves) that pass by a given point each second

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hertz

unit for frequency is

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Hz

abbreviation for hertz

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speed, or wavelength

Changing the ______ or the _______ will alter the frequency of a series of waves

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frequency

increasing the speed increases the

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increased

if the wavelength is shortened the frequency is

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short

x-rays are short or long waves

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wave formula

v = fλ is the

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velocity/speed

v represents

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frequency

f represents

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wavelength

lambda represents

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directly proportional

velocity and frequency are _____ _____ to each other in the wave formula

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twice

if you are traveling at twice the speed _____ as many waves will strike you per second

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no

is velocity constant in the wave formula

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directly proportional

velocity and wavelength are ______ _______ to one another in the wave formula

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inversly proprtional

frequency and wavelength are ______ _______ to each other in the wave formula

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wave formula

this is a mehtod for

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waves per second

hertz is defined as

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constant

in electromagnetic wave formula v is

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3×10^8 m/s

what is the speed of light

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c

abbreviation for the speed of light rather than v

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same

Differ from water waves in that electromagnetic waves always travel the ____ speed in a vacuum such as outer space

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seconds

For electromagnetic waves such as x-rays, unit conversions are often unnecessary because the speed of light is usually given per second and the unit for frequency is Hertz or cycles per second, so the ______ cancel each other out

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electromagnetic wave

we utilize which formula in x-ray

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Plank Formula

E = hf represents the

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A particular shade of green light has a wavelength of 5 X 10-7 meters. How many waves of this green light strike you each second, i.e., what is its frequency in hertz?

0.6 X 1015 Hz

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The frequency of red light is 460 trillion cycles per second, or 4.6 X 1014 hertz. What is the wavelength of this electromagnetic wave?

0.65 X 10-6 meters

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who is the father of quantum theory

Planck

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in Planck’s fomorula, wavelength is _________ _________ to frequency

inversely proportional

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energy is represented by

volts

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for Planck’s formula the higher the voltage the ________ the wavelength

shorter

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the Planck formula relates wavelength to

enery

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h x c=

12.4

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What is the minimum wavelength of an 80 kVp x-ray beam?

0.15 Angstroms

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What is the kV of a single x-ray having a wavelength of 0.2 Angstroms?

62 kV

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the ____ __ represents only the shortest wavelength in the beam

peak kV

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the peak kV represents the

shortest wavelength

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The push and pull of electric charges and magnets are so similar because they are
different manifestations of the same force

electromagnetic force

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the x-ray beam is a __________ beam

divergent

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polyenergetic means

many energies

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the magnetic field is always ____________ to the electrical field

perpendicular

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do electrons have to be traveling down a wire in the form of electricity in order to possess a magnetic field

no

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