19 Official GATE PH Questions with Verified Solutions & Answer Keys
A plane electromagnetic wave is given by E,(ê + e" f)expfi(kz-wt)}. At a given location, the number of times È vanishes in one second is (A) An integer near when S = nл and zero wh...
A nonrelativistic charged particle moves along the positive x-axis with a constant positive acceleration aî. The particle is at the origin at t = 0. Radiation is observed at t = 0 ...
A nonrelativistic charged particle moves along the positive x-axis with a constant positive acceleration aî . The particle is at the origin at t = 0. Radiation is observed at 1 = 0...
Group I lists some physical phenomena while Group Il gives some physical parameters. Match the phenomena with the corresponding parameter. Group I Group II P. Doppler Broadening 1....
Two monochromatic waves having frequencies a and a + A∞ (Aa < w) and corresponding wavelengths 2 and 2 - 2(A2 << 1) of same polarization, traveling along x-axis are superimposed on...
Two monochromatic waves having frequencies @ and w + Aw (Aw < w) and corresponding wavelengths 2 and 2 - Д2 (A2 << 2) of same polarization, traveling along x-axis are superimposed ...
A plane electromagnetic wave traveling in free space is incident normally on a glass plate of refractive index 3/2. If there is no absorption by the glass, its reflectivity is...
A circularly polarized monochromatic plane wave is incident on a dielectric interface at Brewster angle. Which one of the following statements is CORRECT ?...
A long solenoid is embedded in a conducting medium and is insulated from the medium. If the current through the solenoid is increased at a constant rate, the induced current in the...
A plane wave (* + iý)E, expli(kz - cot) after passing through an optical element emerges as (*- iỷ)E, exp (kz- cot), where k and co are the wavevector and the angular frequency, re...
A quarter wave plate introduces a path difference of 2/4 between the two components of olarization parallel and perpendicular to the optic axis. An electromagnetic wave with = (@ +...
(A) (B) (C) Choose the correct statement from the following. Silicon is a direct band gap semiconductor. Conductivity of metals decreases with increase in temperature. Conductivity...
As shown in the figure, an electromagnetic wave with intensity I, is incident at the interface of two media having refractive indices N1 = 1 and n2 = V3. The wave is reflected with...
For normal Zeeman lines observed ∥ and ⊥ to the magnetic field applied to an atom, which of the following statements are true?...
A spectrometer is used to detect plasma oscillations in a sample. The spectrometer can work in the range of 3 × 1012 rad s-1 to 30 × 1012 rad s-1. The minimum carrier concentration...
In a two-dimensional square lattice, frequency \omega of phonons in the long wavelength limit changes linearly with the wave vector k. Then the density of states of phonons is prop...
A plane polarized electromagnetic wave propagating in y-z plane is incident at the interface of two media at Brewster's angle. Taking z = 0 as the boundary between the two media, t...
An unpolarized plane electromagnetic wave in a dielectric medium 1 is incident on a plane interface that separates medium 1 from another dielectric medium 2. Medium 1 and medium 2 ...
Which one of the following is correct for the phase velocity vp and group velocity vg? (c is the speed of light in vacuum)...