A body is placed on a smooth inclined plane of inclination 1 in x. The horizontal acceleration to be given to the inclined plane so that the body on it remains at rest with respect to inclined plane is

An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium of relative permittivity er = 4.0. Then&nbsp;

The ratio of average electric energy density and total average energy density of electromagnetic wave is:

A plane electromagnetic wave&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>E</mi><mo>=</mo><mn>100</mn><mtext> </mtext><mi>cos</mi><mrow><mo>(</mo><mn>6</mn><mo>×</mo><msup><mn>10</mn><mn>8</mn></msup><mi>t</mi><mo>+</mo><mn>4</mn><mi>x</mi><mo>)</mo></mrow><mi>v</mi><mo>/</mo><mi>m</mi></math>&nbsp;propagates in a dielectric medium. The refractive index of medium is&nbsp;

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The photoelectric effect does not take place, if the energy of the incident radiation is less than the work function of metal. Reason R: Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal. In the light of the above statements, choose the most appropriate answer from the options given below. &nbsp;

A light wave travelling linearly in a medium of dielectric constant 4, incident on the horizontal interface separating medium with air. The angle of incidence for which the total intensity of incident wave will be reflected back into the same medium will be (Given : relative permeability of medium&nbsp;<math class="wrs_chemistry" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">μ</mi><mi mathvariant="normal">r</mi></msub><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mn>1</mn></math>)

A body is placed on a smooth inclined plane of inclination 1 in x. The horizontal acceleration to be given to the inclined plane so that the body on it remains at rest with respect to inclined plane is

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