Questions from Modern Physics

Q: Light traveling in air is incident on the surface of a block

Light traveling in air is incident on the surface of a block of plastic at an angle of 62.7° to the normal and is bent so that it makes a 48.1° angle with the normal in the plastic. Find the speed of...

Q: An electromagnetic wave has an electric field given by E (y

An electromagnetic wave has an electric field given by E (y, t) = (3.10 * 105 V/m)

Q: An electromagnetic wave has a magnetic field given by B (x

An electromagnetic wave has a magnetic field given by B (x, t) = -(8.25 * 10-9 T)

Q: A space probe 2.0 * 1010 m from a star

A space probe 2.0 * 1010 m from a star measures the total intensity of electromagnetic radiation from the star to be 5.0 * 103 W/m2. If the star radiates uniformly in all directions, what is its total...

Q: The intensity of a cylindrical laser beam is 0.800 W

The intensity of a cylindrical laser beam is 0.800 W/m2. The cross-sectional area of the beam is 3.0 * 10-4 m2 and the intensity is uniform across the cross section of the beam. a. What is the averag...

Q: A laser beam has diameter 1.20 mm. What is

A laser beam has diameter 1.20 mm. What is the amplitude of the electric field of the electromagnetic radiation in this beam if the beam exerts a force of 3.8 * 10-9 N on a totally reflecting surface?...

Q: A resistor with R = 300 Ω and an inductor are connected

A resistor with R = 300 Ω and an inductor are connected in series across an ac source that has voltage amplitude 500 V. The rate at which electrical energy is dissipated in the resistor is 286 W. What...

Q: He–Ne lasers are often used in physics demonstrations. They

He–Ne lasers are often used in physics demonstrations. They produce light of wavelength 633 nm and a power of 0.500 mW spread over a cylindrical beam 1.00 mm in diameter (although these quantities can...

Q: A sinusoidal electromagnetic wave is propagating in vacuum in the +z

A sinusoidal electromagnetic wave is propagating in vacuum in the +z-direction. If at a particular instant and at a certain point in space the electric field is in the +x-direction and has magnitude 4...

Q: Consider each of the following electric- and magnetic field orientations.

Consider each of the following electric- and magnetic field orientations. In each case, what is the direction of propagation of the wave? a. E = E