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Chem/Phys Section > Phys > Flashcards

Phys Flashcards

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1
Q

Voltage of a circuit equation is

A

V = IR

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2
Q

Index of refraction equation

A

n = c/v c is the speed of light in a vacuum, 3.0x10^8 m/s

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3
Q

The intensity of the radiation emitted is directly proportional to

A

The energy of electromagnetic radiation is directly proportional to the number of photons (emitted)

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4
Q

How is wavelength related to energy of the light?

A

wavelength is inversely related to energy of the light. Shorter wavelengths are higher energy and longer wavelengths are lower energy.

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5
Q

How is the energy of a photon related to the frequency of the light?

A

E = hf h is planck’s constant.

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6
Q

Pressure differentials equation

A

ΔP = CO x TPR CO is cardiac output TPR is total peripheral resistance.

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7
Q

Work equation

A

W=P/T (W/s = kJ)

W=ΔKE = ½mv2 or ½kx2 (elastic)

W= mgh

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8
Q

Standard state conditions

A

298K, 1 atm, 1M conc

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9
Q

gamma decay

A

the emission of photons by the nucleus, atomic mass and number do not change.

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10
Q

beta decay

A

emission of an electron, atomic mass does not change, atomic number increases

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11
Q

beta plus decay

A

emission of a positron, atomic mass does not change, atomic number decreases

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12
Q

alpha decay

A

occurs in large nucleus atoms, atomic mass decreases by 4, atomic number decreases by two

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13
Q

The change in entropy is positive or negative when solids change to gas?

A

positive entropy

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14
Q

negative gibbs free energy change means the reaction is

A

spontaneous

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15
Q

A stationary receiver detects a change in frequency of the signal from a jet flying directly away from it at 300 m/s. Which of the following receivers will detect the same change in frequency from a jet moving away at 600 m/s? -A receiver moving at 900 m/s in the opposite direction as the jet -A receiver moving at 300 m/s in the opposite direction as the jet -A stationary receiver -A receiver moving at 300 m/s in the same direction as the jet

A

A receiver moving at 300 m/s in the same direction as the jet

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16
Q

How does voltage difference relate to energy of an electric field?

A

Ed = ΔV ΔV= W/q = kQ/r

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17
Q

Period equation

A

T = 1/f

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18
Q

How are wavelength and frequency related?

A

λ=c/f

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19
Q

An astronomer observes a hydrogen line in the spectrum of a star. The wavelength of hydrogen in the laboratory is 6.563 x 10-7m, but the wavelength in the star’s light is measured at 6.56186 x 10-7m. Which of the following explains this discrepancy? -The star is moving away from Earth. -The star is approaching Earth.

A

The star is approaching Earth.

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20
Q

Photoelectric effect equation relating kinetic energy, energy and work

A

K= hf-W E=hf=hc/λ

21
Q

Half life equation

A

n=n0e^ -λt

22
Q

velocity of a wave equation

A

v=f λ

23
Q

In standing waves: the end of strings is always _______

A

nodes

24
Q

In standing waves: strings equations are

A

λ= 2L/n (n is relates to the number of humps) f=nv/2L

25
Q

In standing waves: open pipes equations are

A

λ=2L/n (n is the number of nodes) f=nv/2L

26
Q

In standing waves: open pipes always end in

A

Antinodes (open ended)

27
Q

In standing waves: closed pipes equations are

A

λ=4L/n (n is the number of halves of humps 1,3,5….. always odd) f=nv/4L

28
Q

In standing waves: closed pipes always start with ______ and end with _______

A

A node, an antinode

29
Q

Electrical Potential Energy equation

A

V = U/q = E*d

U=q*ΔV = q*Ed = k*Q*q/r

30
Q

Coulomb’s Law equation

A

F (kq1q2)/r^2

31
Q

Electric Field energy equation

A

E=F/q=Q/r^2 Units N/C or V/M

32
Q

What is Wout/Win represent?

A

Efficiency of a machine. Wout/Win = (load)(load distance)/(effort)(effort distance)

33
Q

Describe mechanial advantage

A

Mechanical advantage is the ratio of magnitudes of the force exerted on an object by a simple machine (Fout) to the force of actually applied on the simple machine (Fin).

34
Q

How does work relate to force?

A

W = F*d*cos(Ø)

35
Q

Elastic Potential energy

A

U = ½kx2

36
Q

What are the two components of force on inclinded planes?

A

Fg(parallel) = mg sinø

Fg(perpendicular) = mgcosø

37
Q

What is the equation for torque (rotational equalitibrium)

A

T = rF sinø

38
Q

In sound or pain what is the lowest point of the threshold

A

sensitivity

39
Q

How is Standard Gibbs Free Energy related to Keq

A

ΔG˚ = -RTlnKeq

40
Q

How is power related to voltage?

A

P = V2/R = I2R = IV

41
Q

Pressure guage equation

A

P=pgz

Pressure difference in guage is Pg=P-Patm

42
Q

Buoyant force equation

A

FB=pliquidgvsubmerged

43
Q

What is absolute pressure?

A

Absolute pressure in a fluid due to gravity somewhere below the surface is given by the equation P=P0+pgz

44
Q

Describe Pascal’s Principle

A

P= F1/A1 = F2/A2 so A1d1=A2d2

W=F1d1=F2d2

A change in the pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fulid and to the walls of the containing vessel.

45
Q

What is capacitance?

A

Capacitance is the ability to store charge per unit voltage.

C = Q/V

46
Q

Rate the speed at which sound travels through from fastest to slowest

air, liquid, solid, vaccum

A
  1. solid
  2. liquid
  3. air

doesn’t travel in a vaccum

47
Q

Rate the speed at which light travels through these mediums (fastest to slowest)

air

vaccum

water

glass

A
  1. vaccum
  2. air
  3. water
  4. glass

decreasing speed, increasing index of refraction

48
Q

What is a galvanic cell?

A

redox reaction has a negative ΔG (spontaneous)

there’s a salt bridge

oxidation occurs at the anode (negative), electrons travel from the anonde to the cathode (positive), where reduction occurs

49
Q

What is an electrolytic cell?

A

The cell has a positive ΔG, nonspontaneous. Therefore electrial energy is required to start a reaction.

electrons travel from the cathode (is negative) to the anode (is positive)

emf is negative

Chem/Phys Section (6 decks)

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