Light & EM spectrum Flashcards

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1
Q

Laws of reflection

A

Angle of incidence equals reflected ray

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2
Q

Total internal reflection

A

When the angle of incidence is greater than the critical angle the light is completely reflected within the block

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3
Q

Light wave from air into glass

A

Bends toward the normal

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4
Q

Light wave from glass to air

A

Bends away from the normal.

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5
Q

A blue filter

A

Transmits blue light and absorbs all other light colours

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6
Q

Converging shape

A

Oval shape

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7
Q

Diverging shape

A

Sqaushed rectangle vertical

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8
Q

Focal point of a converging lens will be in front or behind

A

Behind

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9
Q

Does converging lens produce real,virtual or both

A

Both
If the object is too close the rays will diverge forming virtual image that is the correct way up and in front of the object

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10
Q

Why do astronomers use different kinds of telescopes to study different wavelengths

A

Because different material affects EM waves depending on their wavelength eg gamma waves are absorbed by the atmosphere but some radio waves aren’t

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11
Q

EM spectrum order short wavelength to long wavelength

A
Gamma 
X Ray 
Ultraviolet 
Infrared 
Micro 
Radio
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12
Q

How are radio waves produced and detected

A

Produced by oscillations in electrical circuits . Absorbed by metal and cause oscillations in the electric circuits connected to the Ariel

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13
Q

Can microwaves be refracted in the earths atmosphere

A

No

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14
Q

Can radiowaves be refracted in the earths atmosphere

A

Yes at the right angle

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15
Q

Earths energy balance

A

The amount of energy received by the earth is the same as the amount emitted

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16
Q

Greenhouse effect

A

The earth and atmosphere are at a constant temperature when they radiate the same power as they receive
They get warmer when they don’t emit as much as they receive
They then emit as much as they receive but at a new higher temp because the greenhouse gases absorb more energy

17
Q

Fluorescence is

A

When things absorb ultraviolet and re emit it as visible light