Exam 33: Electromagnetic Waves

If the magnetic field in a plane electromagnetic wave is along the y axis and its magnitude is given by B_m sin (kx - **t)in SI units, then the electric field is along the z axis and its magnitude is given by

The diagram shows the passage of a ray of light from air into a substance X.The index of refraction of X is:

Light of uniform intensity shines perpendicularly on a totally absorbing surface, fully illuminating the surface.If the area of the surface is decreased:

The index of refraction of a substance is:

Three polarizing sheets are placed in a stack with the polarizing directions of the first and third perpendicular to each other.What angle should the polarizing direction of the middle sheet make with the polarizing direction of the first sheet to obtain maximum transmitted intensity when unpolarized light is incident on the stack?

Of the following human eyes are most sensitive to:

When light travels from medium X to medium Y as shown:

Polarization experiments provide evidence that light is:

When light passes from air to glass, it bends:

A company claims to have developed material that absorbs light energy without a transfer of momentum.Such material is:

The electric field in unpolarized light:

Light from any ordinary source (such as a flame)is usually:

A pole stands in a river, half in and half out of the water.Another pole of the same length stands vertically on the shore at a place where the ground is level.The shadow cast by the pole in the river on the river bottom is:

The dimensions of are:

In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45° to the axes of the other two.The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is:

A transmitter consists of an LC circuit with an inductance of 15 µH and a capacitance of 23 pF.What is the wavelength of the electromagnetic waves it emits?

The index of refraction of benzene is 1.80.The critical angle for total internal reflection, at a benzene-air interface, is about:

The light intensity 10 m from a point source is 1000 W/m².The intensity 100 m from the same source is:

The diagram shows total internal reflection.Which of the following statements is NOT true?

Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?