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Physics II Lab Final > Final > Flashcards

Final Flashcards

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1
Q

Who first found convincing evidence of the wave nature of light?

A

Thomas Young

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2
Q

The dark spots or dark fringes in diffraction patterns corresponds to a:

A

minimum of the light intensity

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3
Q

The bright spots in a single slit diffraction experiment are due to the:

A

Constructive Interference

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4
Q

To measure the width of a narrow slit we have to measure the average separations between dark fringes.

A

True

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5
Q

The magnifications M of spherical mirrors is described by which of the following equations?

A

M=-q/p

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6
Q

A thin converging lens takes the rays of light that are parallel and:

A

Converges them to a common point.

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7
Q

What happens as your object distance increases:

A

The image distance will approximate the focal length.

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8
Q

In ray tracing there are three rays that are used. Which ray travels through the venter of the lens

A

the Chief ray

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9
Q

The object distance is measured from the lens to the observer

A

False

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10
Q

When light moves from one medium into another medium the speed of light changes. This phenomenon is called refraction.

A

True

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11
Q

Assume the speed of light is particular medium is v=2x10^8 m/s, and given that the speed of light in a vacuum is c=3x10^8 m/s, then the value of the index of refraction for this medium is?

A

1.5 (3/2)

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12
Q

Assume a beam of light hits the boundary separating medium 1, with index of refraction n1 and medium 2, with index of refraction n2. If total internal reflection occurs at the boundary that separates medium 1 and medium 2. then we know which of following?

A

n1 ≥ n2

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13
Q

The index of refraction can be less than 1 for normal materials.

A

False

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14
Q

A charging magnetic flux in the presence of a conductor induces a voltage in the conductor.

A

True

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15
Q

The more turns of wire in a coil, the smaller the magnitude of an EMF is produced.

A

True

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16
Q

The more turns of wire in a coil, the smaller the magnitude of an EMF is produced.

A

False

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17
Q

The area under a voltage vs. time graph represents? Should those areas be equal?

A

The change in the magnetic flux; yes.

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18
Q

What is the foam pad used for?

A

Cushioning the magnet so it does not strike the floor and break.

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19
Q

The induced __________ is proportional to the number of loops, or coils, of the wire and the rate at which the magnetic flux changes inside the loops of wire.

A

EMF

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20
Q

Which of the following algebraic expressions is equal to the Time Constant of a RC circuit?

A

RC

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21
Q

The “RC” in a RC circuit stands for what?

A

Resistor, and capaciot

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22
Q

What is half-life?

A

The time it takes for a fully discharged capacitor to be charged to 50% of its maximum value

23
Q

Resonant Frequency is?

A

When the natural frequency is equal than the forced frequency

24
Q

For an LRC circuit at resonance, the reactance of the inductor and the capacitor cancel each other so that the impedance is equal to the resistance.

A

True.

25
Q

According to the handout what are the three main factors that affect the resistance of a device?

A

Length, cross-section area, type of material

26
Q

The SI units of Resistivity are?

A

Ω*m

27
Q

How does the cross-section of the material affect its resistance?

A

The bigger the cross-section the smaller the resistance

28
Q

In the lab today we will be experimentally confirming the resistivity of what material?

A

Brass

29
Q

How many graphs will you be making in this lab?

A

4

30
Q

Which of the following is true regarding the junction rule?

A

The sum of all the currents entering a junction in a circuit equals the sum of all the currents leaving the junction

31
Q

Kirchoff’s Rules can be used to analyze a complex circuit when the formulas for resistors in parallel, or in series becomes impractical, or even impossible to use.

A

True

32
Q

What is the Loop Rule?

A

The net charge in potential around any closed path in a circuit is zero

33
Q

When measuring the voltage going over particular circuit component the voltmeter (volt sensor) must be connected to that circuit component how?

A

Always in parallel with that component.

34
Q

When measuring the current going over a particular circuit component the Ammeter (current sensor) must be connected to that circuit component how?

A

Always in series with that component.

35
Q

What are the SI units of resistance?

A

Ω

36
Q

What is the equivalent resistance of the three resistors in series as shown in the figure to the right where R1= 100Ω, R2=50Ω, and R3=25Ω

A

175Ω

37
Q

Graphs of I versus V and V versus I have slopes that are:

A

Identical for ohmic Conductors and Equal to R for an I versus V graph and R^-1 for the V versus I graph.

38
Q

What is NOT true about resistors arranged in series?

A

The equivalent resistance is smaller than the smallest of the individual resistors.

39
Q

In today’s lab we are going to use both voltmeter (voltage sensor and an Ammeter (current sensor). How these two devices are connected to our circuit is important. Which of the following is correct?

A

The voltmeter must be in parallel with the resistor, and the ammeter must be in series with the resistor.

40
Q

The SI units for the electric field are?

A

V/m

41
Q

In the electric field sketched around a charge, Q, is oriented by the arrows in the sketch below, Q could be:

A

An electron

42
Q

How is the magnitude of the electric field represented by a graphic description with electric field lines?

A

The electric field intensity is greater where the lines are longer.

43
Q

If some point along the straight line directly between two charges the strength of the electric field at that point is found to be zero what can we say for sure about those two charges?

A

The charges must be of equal magnitude.

44
Q

When the local direction of the electric field lines, at any point, is said to be tangent to the field line at that point.

A

False

45
Q

Electric Charge is:

A

One fundamental property of matter

46
Q

How does an object become electrostatically charged?

A

When electrons are transferred

47
Q

A coulomb is a unit of electrical

A

Charge

48
Q

A quantity of electric charge is measured in a unit called a (an)

A

Coulomb

49
Q

Which of the following is most likely to acquire an electrostatic charge?

A

Objects that are electrical nonconductors.

50
Q

According to Coulomb’s Law which of the following is NOT true?

A

For two point charges the force acting on charge 1 always points towards charge 2, vice versa.

51
Q

In this lab we will be multiplying the measured ∆V by a correction factor B to correct for what?

A

The charges are NOT point charges, but instead are distributed on the surface of spheres.

52
Q

A torsion balance utilizes Hook’s Law to measure the force being exerted on it.

A

True

53
Q

In this lab we will measure the magnitude of the electric changes on each sphere.

A

False

54
Q

In the equation for Coulomb’s Law given in the lab handout E, is what?

A

Permittivity Constant

Physics II Lab Final (1 decks)

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