Free Study material for net csir Physical science 1
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Net CSIR Physical science for part-b and part-c test 1
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A 2x2 matrix A has eigenvalues eiπ/5 and eiπ/6. The smallest value of n such that An=I is
In a series of five Cricket matches, one of the captains culls “Heads“ every time when the toss is taken. The probability that he will win 3 times and lose 2 times is
A binary star system consists of two stars S1 and S2, with masses m and 2m respectively separated by a distance r. If both S1 and S2 individually follow circular orbits around the centre of mass with instantaneous speeds V1 and V2 respectively, the speeds ratio V1/V2 is
The Wave function of a state of the hydrogen atom is given by Ψ= Ψ200 + 2Ψ211 + Ψ210 + √2 Ψ21-1 where Ψnlm is the normalized eigen function of the state with quantum numbers n, l and m in the usual notation. The exepectation value of Lz in the state Ψ is
Given the usual canonical commutation relations, the commutator [A,B] of A =i(xpy-ypx) and B=(ypz +zpy) is
The entropy of a system, S , is related to the accessible phase space volume Γ by S = kbln Γ(E,N,V) where E, N and V are the energy, number of particles and volume respectively. From this one can conclude that Γ
Let ΔW be the work done in a quasistatic reversible thermodynamic process. Which of the following statements about ΔW is correct?
Consider a system of three spins S1 ,S2 and S3 each of which can take values +1 and —1. The energy of the system is given by E = —J[S1S2 +S2 S3 + S3 S1], where J is a positive constant. The minimum energy and the corresponding number of spin conﬁgurations are, respectively,
A live music broadcast consists of a radio-wave of frequency 7 MHZ, amplitude-modulated by a microphone output consisting of signals with a maximum frequency of 10 kHz. The spectrum of modulated output will be zero outside the frequency band
Two bodies of equal mass m are connected by a massless rigid rod of length l lying in the xy - plane with the centre of the rod at the origin. If this system is rotating about the Z -axis with a frequency ω , its angular momentum is
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