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Physics > EMR > Flashcards

EMR Flashcards

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1
Q

Weakest to highest radiation.

A

Radio, microwave, infrared, visible, ultraviolet, xrays, gamma.

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2
Q

Types of fields created to due moving charges.

A

Gravitational, electrical, magnetic.

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3
Q

Highest to Lowest energy of the rainbow

A

Violet, indigo, blue, green, yellow, orange, red

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4
Q

EMR is produced to what?

A

Accelerating charged particles.

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5
Q

Why do your legs look bent in water?

A

Different speeds cause the light to bend.

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6
Q

What happens to the frequency of a wave when it enters a new medium?

A

Does not change.

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7
Q

What is Total Internal Reflection?

A

Light not escaping from a substance

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8
Q

What is white light?

A

Composed of all colours of light

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9
Q

Why does the dispersion of white light show a predictable pattern?

A

Longer wavelengths (red) refract less than shorter wavelengths (violet).

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10
Q

What do all concave lenses have and produce?

A

Negative focal length. Smaller, upright, and virtual images.

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11
Q

What is the difference between lenses and mirrors?

A

Complete opposite of the ray direction when drawn. The concave lens is diverging, concave mirror is converging, and the opposite for convex.

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12
Q

What is x?

A

Node/antinode separation.

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13
Q

What if there is a dark fringe?

A

Must take away 1/2 from n.

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14
Q

What is lines/cm for?

A

D/slit separation

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15
Q

Why is the sky blue?

A

Due to the polarization of air molecules.

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16
Q

What are blackbodies?

A

Objects that absorb all light.

17
Q

What is ultraviolet catastrophe?

A

Intensity just gets higher which means that blackbodies can create an infinite amount of ultraviolet radiation.

18
Q

What is the photoelectric effect?

A

Electron being emitted from an object due to light.

19
Q

What is threshold frequency?

A

The required work needed for the electrons to be emitted from an object.

20
Q

What is the Compton effect?

A

Electrons are scattered due to photons which means that light also behaves like a particle.

21
Q

What does the weird momentum (P) formula equal to?

A

P= square root of (2 x q x v x m). Which can be used to find wavelength.

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