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General Flashcards

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1
Q

sin 0 sin 30 sin 45 sin 60 sin 90

A

sin 0 = 0
sin 30 = 0.5
sin 45 = 0.707
sin 60 = 0.866
sin 90 = 1

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2
Q

cos 0 cos 30 cos 45 cos 60 cos 90

A

cos 0 = 1
cos 30 = 0.866
cos 45 = 0.707
cos 60 = 0.5
cos 90 = 0

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3
Q

tan 0 tan 30 tan 45 tan 60 tan 90

A

tan 0 = 0
tan 30 = 0.577
tan 45 = 1
tan 60 = 1.73
tan 90 = undefined

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4
Q

centripetal acceleration formulas

A

ac = v² / r
ac = w²r
ac = 2πv/T

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5
Q

Centripetal force formulae

A

Fc = mv² / r
Fc = mw²r
Fc = 2πmv / T

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6
Q

tan ø =

A

tan ø = v² / rg

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7
Q

Mean position properties

A

x = 0
a = 0
Fres = 0

KE = max
V = max

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8
Q

Extreme position properties

A

x = max
a = max
Fres = max

KE = 0
V = 0

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9
Q

(SHM)
T =

A

T = 2π/w

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10
Q

Mass attached to spring

A

T = 2π √(m/k)
or
T = 2π √(l/g)

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11
Q

s = ?

A

s = rø

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12
Q

Angular displacement in radian formula

A

2πt/T

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13
Q

1º =

A

1 radian

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14
Q

Angular speed formula

A

2π/T

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15
Q

Angular speed (v)

A

v = r 2π/T

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16
Q

Which waves needs medium

A

Mechanical

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17
Q

Longitudinal waves speed (V) depends on

A

V = √(E/p)
E = elasticity
p = density

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18
Q

Normal medium to denser medium

A

Mechanical waves EM
frequency constant constant
wavelength inc dec
speed inc dec

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19
Q

Intensity formula

A

I = E / tA (E/t = power) so
I = Power x Amplitude so

I = 2π² (density) A² f² V

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20
Q

Audible frequency range

A

20 Hz - 20 kHz

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21
Q

Speed of sound fastest in

A

Solids then liquids then gases

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22
Q

Factors affecting speed of sound

A

Inversely proportional to density
The more moist/humid the faster
The higher the temp the faster

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23
Q

Speed of sound in higher temps formula

A

V = 332 + 0.61t (t = temp of air in Cº)

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24
Q

Constructive and destructive interference path differences

A

constructive: d = m(wavelength)
destructive: d = m + ½ (wavelength)

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25
Q

Phase differences

A

Constructive: 2mπ
Destructive: (2m+1)π

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26
Q

Phase difference in terms of path difference (d)

A

Phase difference = 2π/wavelength x path difference (2π/wave)d
or Phase difference = 360º/wavelength x path difference (360º/wave)d

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27
Q

Plucks at ½ 1/4 and 1/6 or any

A

l wavelength frequency
½ 2L v/2L
1/4 L v/L
1/6 2L/3 3v/2L
any 2L/n nv/2L

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28
Q

Energy at node vs anti node

A

Node = 0
Anti node = max

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29
Q

Wavelengths of closed pipe

A

4L/(2n-1) (only odd)

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30
Q

Wavelengths in open tube

A

2L/n (all harmonics)

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31
Q

f open =

A

2f closed

32
Q

Doppler

A

Source away = + (Away Add)
Source towards = — (Towards subTracT)
Observer away = — and above
Observer towards = + and above

33
Q

Doppler what year

A

1842

34
Q

First law of thermodynamics

A

∆Q = ∆U + ∆W

35
Q

∆U =

A

Change in internal energy = Change in heat energy flowing in — Flowing out work (On system)

∆U = ∆Q - ∆W

36
Q

Isochoric

A

Volume constant so
Q = ∆U

37
Q

Isobaric

A

Constant pressure so
∆Q = ∆U + P(V2-V1)

38
Q

Isothermal

A

Temp is constant
Q = W
Specific heat of a gas in isothermal process is infinite

39
Q

Adiabatic

A

No heat is gained or removed (Q=0)
W = -∆U

40
Q

Stefan Boltzmann Law

A

E = ∂T^4
∂ = Stefan Boltzmann constant = 5.67 x 10^-8

41
Q

Wein’s Law

A

Wavelength(max) = 1/T

42
Q

What did Wein’s Law fail to do What is the opposite of Wein’s Law

A

Wein’s law predicted shorter wavelengths but failed to predict at higher wavelengths

Raleigh Jean’s law predicted only long wavelengths but failed to predict at shorter wavelengths

43
Q

KE max =

A

KEmax = hfo — ø
KEmax = threshold frequency — work function
KEmax = min frequency needed to eject e — min energy needed to eject e

44
Q

KEmax also equals

A

KEmax = eVo (stopping potential)

45
Q

In photoelectric effect the stopping potential depends on

A

Frequency

46
Q

Electron will have max KE when it has

A

Short wavelength

47
Q

Comptons wavelength

A

0.024 A°

48
Q

Pair production happens when

A

Energy greater than 1.02 MeV

49
Q

Pair annihation

A

0.51 MeV ???

50
Q

Emax (coming from infinity)

A

Wavelength minimum

51
Q

Emin (coming from one level up)

A

Wavelength max

52
Q

isobar

A

Top same
Bottom different

53
Q

Isotone

A

Neutron number same

54
Q

Mirror nuclei

A

Proton X = Neutron Y
and vice versa

55
Q

Radiation examples

A

Alpha= Radon 222
Beta= Stronium 94
Gamma= Cobalt 60

56
Q

Continuous vs discrete

A

Discrete = alpha and gamma
Continuous = beta

57
Q

Penetration of radiation

A

Alpha cant get past paper
Beta cant get past Aluminum sheet
Gamma cant get past Lead sheet

58
Q

Activity units

A

Rutherford
Baquerel (Bq)
Curie

59
Q

1 Curie = ____ Bq
1 Rutherford = ____ Bq

A

1 Curie = 3.7 x 10^10 Bq
1 Rutherford = 10^6 Bq

60
Q

Activity (A) =

A

Rate of decay

61
Q

Decay constant

A

0.693

62
Q

Rectification

A

AC to DC

63
Q

Forward bias in rectification

A

High to low potential

64
Q

Magnetic Force

A

F = ILBsinø

65
Q

Tesla

A

B = F/IL
1 Tesla = Nm-1 A-1
1 Tesla = 1 Wb m-2
1 Tesla = 10^4 Gauss

66
Q

Flux =

A

Flux = B • A cos ø

67
Q

Maximum flux angle

A

90°

68
Q

Flux units

A

Weber
1 Weber = kgm² A-1 s-2

69
Q

Fb =

A

Fb = qvB sinø

70
Q

Faradays Law of EM induction

A

€ = (NEG) number of loops x flux / time

71
Q

Step up transformers

A

inc voltage and inc loops in secondary coil

72
Q

1 kWh =

A

3.6 MJ

73
Q

Conductance (G)

A

1/R

74
Q

Conductance units

A

mho and Siemen

75
Q

Conductivity unit

A

mho/m
Siemen/m

76
Q

smaller power lamp glows ____

A

brighter

Physics (3 decks)

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