Question54:-The relation between the Einstein coefficients 2 21)” 800 8 (21) 5
‏)نم‎ )21((/)8-)21(( = 1
` (1)/2)`
‏لاطام8)‎ (2))/(6^(2))
மக்கு ண்டு
Correct Answer:- Option-D
Question55:-In a canonical ensemble, the elements differ in their
A:-volume
B:-energy
C:-temperature
D:-number of particles
Correct Answer:- Option-B
Question56:-The Halmholtz free energy F, absolute temperature T and partition function Z of a canonical ensemble are
related as

۱2 ۴-ھ
‎B:-F=kTIhZ‏
‎C:F=-k1Z‏
‎D:-F = KTZ‏

Correct Answer:- Option-A
Question57:-The mass defect per nucleon is called
A:-packing fraction
B:-quadrupole moment
C:-angular momentum
D:-binding energy
Correct Answer:- Option-A
Question58:-In how many directions, the electrons in a quantum dot are confined 7

Correct Answer:- Option-C

Question59:-The energy versus wave vector graph of an electron in free space is a
A:-Straight line
B:-parabola
C:-hyperbola
D:-circle
Correct Answer:- Option-A

Question60:-The bandgap energy of GaAs is about
A:-0.42 eV

B:-1.42 eV

C:-0.42 keV

D:-1.42 keV

Correct Answer:- Option-B

Question61:-The light emission mechanism in LED is
A:-electroluminescence
B:-photoluminescence
C:-chemiluminescence
D:-thermoluminescence
Correct Answer:- Option-A

Question62:-In a first order phase transition, which among the following statements is true 7
A:-volume is continuous at the boundary
B:-entropy is continuous at the boundary
C:-entropy is discontinuous at the boudnary
D:-a latent heat is not involved
Correct Answer:- Option-C

Question63:-The chemical potential of a photon gas is
A:-infinity

ite

C:-imaginary