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Physics 30 > Unit 3 – EMR > Flashcards

Unit 3 – EMR Flashcards

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1
Q

What is EMR?

A

Accelerating electric charges -> changing magnetic/electric fields

Electric and magnetic fields perpendicular to each other

Medium not required

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2
Q

Radio waves

A

m-cm

oscillation of electrons in circuit

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3
Q

Microwaves

A

cm-μm

oscillation of electrons in tubes

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4
Q

infared

A

μm-nm

transition of valence electroms

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5
Q

Visible light

A

Around 750 (red) to around 420 (purple) nanometers

transition of valence electrons!!

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6
Q

Ultraviolet

A

100-10 nm

transition of valence electrons!!!

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7
Q

X-rays

A

tenths of nm

electrons suddenly move/stop

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8
Q
A
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9
Q

Maxwell

A

First man to explain electromagnetism in relation to fields (could not test it, Hertz did)

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10
Q

Specular reflection

A

Rays/waves/particles reflecting off a smooth surface (parallel reflection)

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11
Q

Diffuse reflection

A

Rays/waves/particles striking an irregular surface (scattered reflection)

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12
Q

Refraction

A

Light passing from one medium to another -> change in wavelength and speed

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13
Q

Dispersion

A

Light splitting into its components (colours)

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14
Q

Total internal reflection

A

More dense to less dense medium

Angle of reflection is 90º or higher, angle of incidence is beyond critical angle

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15
Q

Concave mirror

A

Mirror bends inwards
Light reflects towards the focal point

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16
Q

(concave) Object beyond 2F/C

A

Real, inverted, smaller

17
Q

(concave/converging) Object at C/2F

A

Real, inverted, same size

18
Q

(concave) Object between F and C

A

Real, inverted, larger

19
Q

(concave/converging) Object at F

A

No image

20
Q

Convex mirror

A

Virtual, erect, smaller

Light reflects away from the focal point (image created from dotted lines)

21
Q

Converging lens

A

Teardrop shape ()

Light bends inward

22
Q

Diverging lens

A

Hourglass shape )(

Light bends outward

Virtual, erect, smaller

23
Q

(converging) Object beyond 2F/C

A

Real, inverted, smaller

24
Q

(converging) Object between C and F

A

Real, inverted, larger

25
Q

(converging/concave) Object between F and lens

A

Virtual, erect, larger

Physics 30 (1 decks)

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