Who was the first person to observe

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15 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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Who was the first person to observe
superconductivity?

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2
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21
9
1.
Leon Cooper

2.
Walther
Meissner

3.
Sir James Dewar

4.
Heike
Kamerlingh
-
Onnes


The technological advance that allowed
Onnes

to observe superconductivity was?

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5
42
1
0
1
6
1.
liquefying helium


(T = 4 K)

1.
solidifying hydrogen
(T = 14 K).

2.
liquefying
hydrogen(
T =
20 K
)

3.
liquefying nitrogen
(T = 77 K)

The

first

superconducting

material

discovered

was


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4
2
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32
1.
Copper

2.
Mercury

3.
Helium

4.
YBCO

Which

of

the

following

is

NOT

a

property

of

a

superconductor?


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4
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2
1.
The electrical resistance
becomes zero.

2.
The superconducting
properties develop
abruptly below a critical
temperature.

3.
A lot of energy is lost to
resistive heating.

4.
The superconductor
expels magnetic fields.

What

does

a

Cooper

pair

refer

to?

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44
0
2
4
1.
Two electrons that attract
each other due to
interactions with the lattice
atoms.

2.
Two atoms that vibrate in
unison to improve
conduction.

3.
The regular current and
super current in a
superconductor.

4.
The north and south
magnetic poles induced in
a superconductor.

Part of the theory of superconductivity relies on the fact
that electrons travel together through the material as
waves, without bouncing off the atoms in the
superconductor. This idea of particles acting like waves is:

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33
7
4
1.
resistance

2.
Newtonian physics

3.
Plinko

4.
quantum
mechanics

A

high
-
T
C

superconductor

becomes

a

superconductor

at

a

temperature


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9
0
3
38
1.
near the
temperature of
liquid helium.

2.
above the
temperature of
liquid nitrogen
but below
room temperature.

3.
near typical room
temperature.

4.
above room temperature
but below the boiling point
of water.

Which

of

the

following

is

not

a

possible

application

of

high

temperature

superconductors?

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2
3
4
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2
34
3
1.
loss
-
less power
transmission.

2.
high power
electromagnets.

3.
quantum computing.

4.
magnetically levitated
trains.

Which

of

these

explains

the

principle

reason

that

Maglev

trains

are

able

to

levitate?

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2
3
4
5
43
0
1
1.
The formation of
Cooper Pairs in the BCS
theory.

2.
Condensation of liquid
Helium.

3.
Superconductors have
north and south
magnetic poles.

4.
The expelling of
magnetic fields due to
the
Meissner

effect.

How

many

Nobel

Prizes

have

been

awarded

based

on

work

related

to

superconductivity?

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2
3
4
0
1
36
12
1.
Zero

2.
Two

3.
Five

4.
Nine