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Physics > Physics Properties of waves 4.1 - 4.5 > Flashcards

Physics Properties of waves 4.1 - 4.5 Flashcards

1
Q

What do waves transfer

A

Waves transfer energy from one point to another

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2
Q

Do waves carry matter? (Yes, no)

A

No

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3
Q

What is the tip of a wave called?

A

Crest

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4
Q

What is the bottom of a wave called?

A

Trough

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5
Q

What is the displacement from equilibrium on a wave graph to the tip of a wave called?

A

Amplitude

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6
Q

What is frequency and what is it measured in?

A

Frequency is the number of complete oscillations per second measured in hertz

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7
Q

What is a wavelength?

A

The distance from crest to crest or trough to trough

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8
Q

What are the two formulas for waves and what are the units measured in?

A

f = 1/f
v = wavelength * frequency where frequency is measured in hertz, t is time measured in seconds, wavelength is measured in meters, and v is wave speed measured in meters per second

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9
Q

What direction does a longitudinal wave travel with respect to its direction of energy transfer?

A

It travels parallel to the direction of energy transfer

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10
Q

What direction does a transverse wave travel with respect to its direction of energy transfer?

A

It travels perpendicular to the direction of energy transfer

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11
Q

What is reflection

A

Reflection is the bouncing back of light after it hits a surface

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12
Q

What are the two types of reflection

A

Specular and diffuse or scattered reflection

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13
Q

What is specular reflection

A

Specular reflection is when the boundary or surface that the light ray hits is smooth and can provide a clear image

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14
Q

What is diffuse or scattered reflection

A

Diffuse or scattered reflection is when the boundary or surface that light hits is bumpy and the image provided can’t be seen properly or is blurry

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15
Q

When light hits a surface at an angle of 45 degrees, what will be the angle of reflection and why

A

45 degrees because the angle of incidence is equal to the angle of reflection

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16
Q

What happens to a light ray when it enters a denser medium?

A

it gets bent towards the normal of the surface of the denser medium

17
Q

What happens to a light ray when it exits a denser medium into a less dense medium?

A

It bends away from the normal

18
Q

Which color bends the least from the normal as it emerges from a dense medium?

A

Red

19
Q

Which color bends the most from the normal as it emerges from a dense medium?

A

Violet

20
Q

Which color has the longest wavelength and the lowest energy

A

Red

21
Q

Which color has the shortest wavelength and the highest energy

A

Violet

22
Q

What is refractive index

A

Refractive index is a measure of the speed of light in a medium compared to the speed of light in a vacuum like ratios

23
Q

Is refractive index directly proportional to the density of the medium (yes or no)

A

Yes

24
Q

What is the refractive index of a vacuum

A

1

24
Q

Is the refractive index of glass higher than that of a vacuum? (Yes or no)

A

Yes

25
Q

What is a critical angle

A

A critical angle is the angle of incidence for which the angle of refraction is 90 degrees

26
Q

What affects the magnitude of the critical angle?

A

Refractive index

27
Q

What is the angle of refraction for the following: (you don’t have to give exact measurements)
i = incidence
c = critical angle

When i = c
when i > c
when i < c

A

90 degrees
Total internal reflection
angle less than 90 degrees

28
Q

What is total internal reflection?

A

Total internal reflection is when the incident light ray gets reflected back into the medium

29
Q

What are the three formulas for refractive index?

A

n = 1/sin c
n = speed of light in vacuum / speed of light in medium
n = sin i / sin r

Where c = critical angle, i = angle of incidence, r = angle of refraction

Physics (21 decks)

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