Question is ⇒ If E is energy level of electron and EF is Fermi level, then, Options are ⇒ (A) all quantum states with E less than EF will be occupied at T = 0, (B) all quantum states with E less than EF will be empty at T = 0, (C) some quantum states with E less than EF will be occupied at T = 0, (D) none of the above, (E) , Leave your comments or Download question paper.

Question is ⇒ If E is energy level of electron and EF is Fermi level, then, Options are ⇒ (A) all quantum states with E less than EF will be occupied at T = 0, (B) all quantum states with E less than EF will be empty at T = 0, (C) some quantum states with E less than EF will be occupied at T = 0, (D) none of the above, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If E is energy level of electron and E_F is Fermi level, then
A.	all quantum states with E less than E_F will be occupied at T = 0 [Correct Answer]
B.	all quantum states with E less than E_F will be empty at T = 0 [Wrong Answer]
C.	some quantum states with E less than E_F will be occupied at T = 0 [Wrong Answer]
D.	none of the above [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Silicon and germanium have diamond structure. The number of atoms in a volume equal to a³ where a is the edge of elementary cube are
32
16
8
4

⇒

Assertion (A): Potentiometers can not be used as error detectors in position control systems.

Reason (R): The resolution of a potentiometer places an upper limit on its accuracy

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
R is correct but A is wrong

⇒ In following circuit, R_B will be if V_CC = 10 V, V_S = 2 V, R_C = 5 kΩ, R_S = 90 kΩ, β = 50, I_CE = 0, V_CEsat = 0
230 K
235 K
240 K
250 K

⇒ Schmitt trigger can be used as a
comparator
square-wave generator
flip-flop
all of these

⇒ In the expression 3 * * 2 ** 4 ** 2 in FORTRAN 77 which exponentiation is performed first
4 * * 2
2 * * 4
3 * * 2
all exponentiation are performed together

⇒ A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?
0.1
0.25
0.5
0.75

⇒ In the circuit of figure, the value of r_e is (neglecting v_{be100 Ω
75 Ω
50 Ω
25 Ω}

⇒ In a network with twelve circuit elements and five nodes, what is the minimum number of mesh equations?
24
12
10
8

⇒ In Schering bridge, the potential of detector above earth potential is about
a few volts
10 kV
1000 V
either (a) or (b)

⇒ When the mains supply is switched off the contents of primary computer memory are lost.
TRUE
FALSE

⇒ What is the result for expression (map metho
A + D + BC
A + D
A D + B C
A + D + BC

⇒ A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output frequency of the carrier will be
26 kHz
260 kHz
26 MHz
260 MHz

⇒ The input impedance of short-circuited line of length l where λ/4 < l < λ/2, is
resistive
inductive
capacitive
none of the above

⇒ The number of protons in a copper atom are
2
9
11
29

⇒ The resistance of series field winding is a low resistance.
TRUE
FALSE

⇒ As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?
High gain and better sensitivity
Better selectivity at high frequencies
Stability
Noise suppression

⇒ If R_T, R_h represent condition for reciprocity in case of transmission parameter and hybrid parameter respectively and similarly S_T, S_h represent condition for symmetry in case of transmission parameter and hybrid parameter respectively then match the followi
1 - c 2 - d 3 - a 4 - f
1 - c 2 - b 3 - e 4 - d
1 - e 2 - d 3 - a 4 - b
1 - e 2 - d 3 - a 4 - f

⇒ Is the interrupt-enable flag?
Low
High
Never
None

⇒ The number of leads in a power semiconductor diode are
2
3
4
2 or 3

⇒ A memory system of size 16 K bytes is required to be designed using memory chips having 12 address lines and 4 data lines-each. The number of such chips required to design and the memory system is :
2
4
8
16

⇒ An air-filled rectangular waveguide has dimensions 8cm x 10cm . The wavelength of waveguide at frequency 3 GHz
25 cm
100 cm
16.13 cm
23.09 cm

⇒ Consider the following statements about radar Beacon

It is also called transponder.
It includes pulse transmitter, receiver and antenna.
It replies with full power even when the signal receives is weak.

Which of the above statements are correct?
All
1 and 2 only
2 and 3 only
2 only

⇒ In figure, the value of R shoul
5 kΩ
50 kΩ
20 kΩ
10 kΩ

⇒

Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V.

Reason (R): When an SCR is conducting, the junction temperature is about 200°C.

Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct

⇒ In the basic series inverter circuit, the source current has
low harmonic content
high harmonic content
low or high harmonic content depending on firing angle
zero harmonic content

⇒ In which counter does the maximum frequency depend on the modulus?
Synchronous
Ripple
Both synchronous and ripple
Neither synchronous nor ripple

⇒ As compared to dimensions of most feeds, the skin depth at microwave frequencies is
of the same magnitude
much larger
much smaller
either (b) or (c)

⇒ In photoelectric emission the maximum kinetic energy of emitted electron is proportional to
f
f
f²
f³

⇒ In a reactance function
all poles are simple
all poles and zeros are simple
all poles and zeros are simple and lie on jω axis only
all poles and zeros lie on negative real axis

⇒ An RC snubber circuit is used to protect a thyristor against :
false triggering
failure to turn on
switching transients
failure to commutate