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physics 2 > Physics 2 true and false > Flashcards

Physics 2 true and false Flashcards

1
Q

If you place a proton directly on top of an electron, the net charge of the system is zero (q1)

A

True

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2
Q

In insulated materials, electrons are tightly bound to atoms and are not free to move (q1)

A

True

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3
Q

Assuming electrons begin to drift to the right, the current points to the left (q5)

A

True

Current is direction of positive charges

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4
Q

The drift velocity of the electrons in the wire is extremely high (q5)

A

False

SLOW!

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5
Q

Good conductors have high resistivity (q5)

A

False

high resistivity=insulator

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6
Q

Equivalent resistance of parallel resistors is always less than either resistor (Q6)

A

True

Add in series!

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7
Q

DIAGRAM FOR CAPACITOR (q6)

A

KNOW! :)

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8
Q

Moving magnets near coils of wire can cause charges in those coils to move. (q8)

A

True

Electromagnitism!

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9
Q

Moving coils of wire near magnets does not cause the charges in the coil to move ( q8)

A

False

Magnets near wires moving are always creating charge movement

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10
Q

A coil of wire sits in a constant, uniform magnetic field. There is a current in the wire (q8).

A

False

if the magnetic field is constant, no current.

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11
Q

An inductor and a solenoid are virtually identical (q8)

A

True

Same thing :)

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12
Q

When potential is applied to an inductor, the effect of the inductor is to slow down the charge in current through the inductor (q9)

A

True

Back EMF

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13
Q

The RMS voltage is greater than the peak voltage (q9)

A

False

RMS is the root mean squared AVERAGE! peak is just that: a peak.

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14
Q

The current in a resistor is out of phase with the applied AC voltage (q9)

A

False

Resistor is IN PHASE!!!

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15
Q

The displacement current between the plates of a capacitor is caused by charges flowing across the plates. (q10)

A

False

No charges flow directly across the plate

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16
Q

All electromagnetic phenomena can be described with Maxwell’s Equations (q10)

A

True

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17
Q

X-Rays have longer wavelengths than visible light (q10)

A

False

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18
Q

A diverging lens always produces a real image of an object placed in front of it. (q12)

A

False

True for convex

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19
Q

For an upright image, the magnification is positive; for an inverted image, the magnification is negative. (q12)

A

True

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20
Q

The Ray Model of Light correctly predicts double-Slit Interference (q13)

A

False

Because geometry doesn’t work in this scenario

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21
Q

The diffraction of light limits the ability to see small or distance objects. (q13)

A

True

22
Q

Electric forces always point parallel to the dirrection of the electric field (t1)

A

True

23
Q

Voltage is a measure of potential energy (t1)

A

False

FIGURE IT OUT

24
Q

If the total flux through a closed surface is zero, then no electric field exists within the surface (t1)

A

False

No electric field is founded within the surface

25
Q

In a parallel plate capacitor, you can think of the energy as being stored in the electric field between the plates (t1)

A

True

26
Q

The electric field inside a charged conductor in equilibrium is zero (t1)

A

True

27
Q

Doubling the radius of the conducting wire increases its resistance (q1)

A

False

Inversely related meaning increased cross-section=decreased resistivity.

28
Q

In typical Materials, heating them up reduces their resistance to charge flow (q1)

A

False

particles move faster taking up more space.

29
Q

A single solenoid carrying a current will store magnetic energy (t2)

A

True

Back EMF caused by magnetism [right hand rule!]

30
Q

Transformers allow one to change the voltage delivered by an AC supply (t2)

A

True

ratio of turns to voltage

31
Q

An RC circuit can be used to create radio waves of a specific frequency (t2)

A

False

must also have an inductor

32
Q

The Poynting vector points in the direction of motion of the E-M Wave (t2)

A

True

33
Q

The Resistance of two parallel resistors is always more than their sum (t2)

A

False

34
Q

A stationary electron in a strong magnetic field will experience acceleration (t2)

A

False

Only if it already in motion.

35
Q

Light travels more slowly in glass than air (t3)

A

True

36
Q

Light is focused most effectively by spherical mirrors (t3)

A

False

Parabolic

37
Q

Dispersion describes the separation of light’s colors by refraction

A

True

38
Q

Light rays entering the human eye are primarily bent through refraction into the vitreous humor (the liquid) [t3]

A

TRUE

Practice test is misleading!

39
Q

Images are always smaller in convex mirrors

A

True

40
Q

Astigmatism describes the aberration caused by different wavelengths focusing to different points. (t3)

A

False

Different radii of spheres. Differing wavelenths is chromatic

41
Q

Refraction describes the process of light reflecting off a smooth surface (t3)

A

False

Reflection is reflecting, refraction is going through

42
Q

Frequency is unchanged by the medium in which light travels

A

True

wavelength and speed can change

43
Q

Two lightbulbs a distance apart will form a pair of coherent light sources (t3)

A

False

Hard to get coherent light (ex. lasers)

44
Q

The diffraction of light limits the ability to see small or distant objects

A

True

45
Q

It is possible for light to experience total transmission as it is incident on glass from Vacuum

A

False

All light reflects at least a little bit.

46
Q

Lateral magnification is m=0.5

A

False

for flat mirrors m=1

47
Q

A diffraction grating of 100 slits has greater resolving power than a double-slit grating

A

True

more is better!

48
Q

Maxwell claimed that a current is created between the plates of a capacitor by the changing magnetic field

A

False

Displacement current is created by changing electric fields.

49
Q

two Wires will be drawn together if they are carrying current in the same direction

A

True

Right hang rule

50
Q

Typical resistors are limited in how much current they can conduct

A

True

Resistors can burn out!

51
Q

Transformers allow one to change the voltage delivered by an AC supply.

A

True

Ratio of coils for voltage change.

physics 2 (2 decks)

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