32 Official GATE PH Questions with Verified Solutions & Answer Keys
The $D_1$ and $D_2$ lines of Sodium ($3^2P_{1/2} \rightarrow 3^2S_{1/2}$ and $3^2P_{3/2} \rightarrow 3^2S_{1/2}$) will split on the application of a weak magnetic field into...
In a He-Ne laser, the laser transition takes place in (A) He only. (B) Ne only. (C) Ne first, then in He. (D) He first, then in Ne....
In accordance with the selection rules for electric dipole transitions, the 4'P, state of helium can decay by photon emission to the states (A) 2'So, 2'P, and 3'D2 (B) 3'P1, 3'D2 a...
The hyperfine structure of Na (3?P32) with nuclear spin / = 3/2 has (A) 1 state. (B) 2 states. (C) 3 states. (D) 4 states....
The allowed rotational energy levels of a rigid hetero-nuclear diatomic molecule are expressed as e, = BJ(J +1), where B is the rotational constant and J is a rotational quantum nu...
The coherence length of laser light is (A) directly proportional to the length of the active lasing medium. (B) directly proportional to the width of the spectral line. (C) inverse...
Which one of the following statement is INCORRECT in vibrational spectroscopy with anharmonicity? (A) The selection rule for vibrational spectroscopy is Av = ‡1, + 2,... (B) Anharm...
When the refractive index j of the active medium changes by Ayu in a laser resonator of length L, the change in the spectral spacing between the longitudinal modes of the laser is ...
Five energy levels of a system including the ground state are shown below. Their lifetimes and the allowed electric dipole transitions are also marked. 10-7 s 4 2 x 10-8s 3 10-6g 2...
The expectation value of the particle energy is 1| tỉ 4a2 +1 tỉ (A) 2m 2a3/2 B) 2m a? (C) 2m 4a3/2 (D) 8mа312 Common Data for Questions 55 and 56 : Consider the Zeeman splitting of...
The Zeeman spectrum is (A) randomly polarized (B) only polarized (C) only o polarized (D) both i and o polarized...
The fine structure line having the longest wavelength will split into (A) 17 components (B) 10 components (C) 8 components (D) 4 components PH 13/16 2009 PH Linked Answer Questions...
The thermal conductivity of a given material reduces when it undergoes a transition from its normal state to the superconducting state. The reason is: (A) The Cooper pairs cannot t...
To detect trace amounts of a gaseous species in a mixture of gases, the preferred probing tool is (A) Ionization spectroscopy with X-rays (B) NMR spectroscopy (C) ESR spectroscopy ...
The number of distinct spectral lines that are observed in the resuitant Zeeman spectrum is (A) 2 (B) 3 (C) 4 (D) 6 PH 1224 2010...
The number of distinet spectral lines that are observed in the resultant Zeeman spectrum is (A) 2 (B) 3 (C) 4 (D) 6 PH 1224 2010 PH...
Match the typical spectroscopic regions specified in Group I with the corresponding type of transitions in Group II. Group I Group II (P) Infra-red region (i) electronic transition...
The terms 1 2 j , j J arising from 2s13d1 electronic configuration in j-j coupling scheme are (A) 2,1 3,2 1 3 1 5 , and , 2 2 2 2 (B) 1,0 2,1 1 1 1 3 , ...
The Lagranges equation of motion of the particle is (A) 2 x gax (B) 2 2 2 2 (1 4 ) 2 4 m a x x mgax ma xx - - (C) 2 2 2 2 (1 4 ) 2 4 m a x x mgax ma xx (D) 2 x gax - y...
The number of spectral lines allowed in the spectrum for the 22 transition in sodium is ____________. Q. 26 to Q. 55 carry two marks each....
The number of normal Zeeman splitting components of 1P → 1D transition is (A) 3 (B) 4 (C) 8 (D) 9...
The intensity of a laser in free space is 150 mW/m2. The corresponding amplitude of t he electric field of the laser is ____________ V/m. (𝜀𝜀0 = 8.854 × 10−12 𝐶𝐶2/𝑁𝑁. 𝑚𝑚2)...
The excitation wavelength of laser in a Raman effect experiment is 546 nm. If the Stokes' line is observed at 552 nm, then the wavenumber of the anti-Stokes' line (in cm") is...
Match the phrases in Group I and Group II and identify the correct option. Group I Group I (P) Electron spin resonance (ESR) (Q) Nuclear magnetic resonance (NMR) (R) Transition bet...
In the $\text{SU}(3)$ quark model, the triplet of mesons $(\pi^+, \pi^0, \pi^-)$ has...
The number of spectroscopic terms resulting from the L.S coupling of a 3p electron and a 3d electron is...
Match the physical effects and order of magnitude of their energy scales given below, where a = Arteohc is fine structure constant; Me and M, are electron and proton mass, respecti...
Which one of the following is an allowed electric dipole transition? (A) 'So → 3S1 (B) 2P3/2 →2D5/2 (C) =D5/2 →2P1/2 (D) 3Po → SDo...
The term symbol for the electronic ground state of oxygen atom is (A) 1So (B) 'Dz (C) 3рo (D) 3P2...
The donor concentration in a sample of n-type silicon is increased by a factor of 100. Assuming the sample to be non-degenerate, the shift in the Fermi level (in meV) at 300 K (rou...
Two observers O and O' observe two events P and Q. The observers have a constant relative speed of 0.5c. In the units, where the speed of light, c, is taken as unity, the observer ...
The atomic number of an atom is 6. What is the spectroscopic notation of its ground state, according to Hund's rules?...