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4th six weeks physics flashcards > 4th sw flashcards > Flashcards

4th sw flashcards

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1
Q

First Law of Thermodynamics

A

energy can neither be created nor destryed

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2
Q

Second Law of Thermodynamics

A

entropy always increases over time

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3
Q

Third Law of Thermodynamics

A

when the temperature reaches absolute zero, there is zero entropy

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4
Q

Entropy

A

a measure of disorder of a system

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5
Q

Convection

A

heat circulate through fluids like air or water

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6
Q

Radiation

A

transfer of heat between two objects not touching

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7
Q

Conduction

A

heat moving through toching objects

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8
Q

flat line on phase change graph

A

phase change

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9
Q

what happens to temperature when energy is being absorbed

A

the temperature does not change

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10
Q

what happens to temperature when energy is being released

A

temperature increases

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11
Q

latent heat

A

change in physical state

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12
Q

specific heat

A

change in temperature

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13
Q

latent heat equation

A

Q=mL

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14
Q

specific heat equation

A

Q=Cm△T
Q=Q1+Q2+Qn

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15
Q

number of fusion for water

A

334

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16
Q

number of vaporization for water

A

2,260

17
Q

lens

A

transparent object with at least one curved side that causes light to change direction

18
Q

reflection

A

bounding a wave off a surface

19
Q

refraction

A

bending of a wave as it passes through different mediums

20
Q

focal point

A

where parallel lines converge

21
Q

focal length

A

distance from mirror/lens to focal point

22
Q

convex

A

*thicker in the middle
*light bends inward
*makes objects larger

23
Q

concave

A

*thicker on the ends
*light bends outwards
*makes objects smaller

24
Q

then lens equation

A

1/f = 1/do + 1/di

25
Q

magnification equation

A

m = hi/ho

26
Q

doppler effect

A

a moving source of waves will have a higher frequency for someone standing in front of it, and a lower frequency for someone standing behind it

27
Q

resonance

A

every object has its own natural resonant frequency, at which it will vibrate if exposed to another wave which has the same frequency

28
Q

refraction

A

bending of waves as they change from one medium to another. Fast medium to slow = bends to normal, slow to fast = bends away

29
Q

diffraction

A

the bending of waves as they go through holes/slits or around corners

30
Q

reflection

A

the reflection of a wave across the normal of a surfce. Angle of incidence = angle of reflection

31
Q

interference

A

the additive (constructive) or subtractive (destructive) result of two waves being in superposition

32
Q

wave

A

a repeating periodic disturbance. Waves are described by their size/displace,emt, the frequency of a full cycle, and the velocity of the wave

33
Q

longitudinal wave

A

a wave that moves in a straight line. Also known as pressure waves. Longitudinal waves require a medium to travel through. Sound is a longitudinal wave that moves at 340 m/s at STP

34
Q

transverse wave

A

a wave that moves in a serpentine pattern from one side of an axis to another. Mechanical transverse waves need a medium, but EMR does not need a medium

35
Q

wavelength

A

the distance between two troughs or peaks, or between two areas of compression or rarefaction

36
Q

frequency

A

the number of peaks/troughs or compressions/rarefactions per unit of time. Frequency determines pitch for sound and color/type for EMR

37
Q

amplitude

A

the maximum displacement from equilibrium position. The more amplitude in a sound wave, the louder it is. The more amplitude in a light wave, the brighter it is

38
Q

oscillation

A

wave oscillations (back and forth motion) are parallel to the direction of motion for longitudinal waves, and perpendicular to the direction of motion for transverse waves

39
Q

EMR

A

any wave that uses photons as messenger particles. Does not require a medium. All photonically mediated radiation is EMR. Radio is EMR.

4th six weeks physics flashcards (1 decks)

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