# Sol4 - the magnetic field in the wave and also...

This preview shows pages 1–5. Sign up to view the full content.

UAHuntsville Spring, 2010 PH 113: Homework Solutions No. 4 Solution 21: Equation (E16.13) is for the average intensity of an EM wave, and is W=c <E^2>/(8 \pi k). Solution 22: Equation (E16.13) is for the average intensity of an EM wave, and is W=c <E^2>/(8 \pi k).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Solution 23:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Solution 24: Solution 25: From the figure, we know that when the middle polarizer is at θ 2 = 0 o ,90 o there is no light going through the system, which means that the middle polarizer is parallel to either the first or last one, so that effectively the system is crossed. With no loss of generality, we assume 1 = 0 o and 3 = 90 o . Therefore, the total intensity is given by I = 1 2 cos 2 0 o 2 180 o π Λ Ν Μ Ξ Π Ο cos 2 90 o 2 180 o Λ Ν Μ Ξ Π Ο and for 2 = 30 o we find I = 0.09375 . Solution 26:
Solution 27: (a) The polarization direction is defined by the electric field (which is perpendicular to
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the magnetic field in the wave, and also perpendicular to the direction of wave travel). The given function indicates the magnetic field is along the x axis (by the subscript on B ) and the wave motion is along – y axis (see the argument of the sine function). Thus, the electric field direction must be parallel to the z axis. (b) Since k is given as 1.57 × 10 7 /m, then λ = 2 π /k = 4.0 × 10 − 7 m, which means f = c / λ = 7.5 × 10 14 Hz. (c) The magnetic field amplitude is given as B m = 4.0 × 10 − 6 T. The electric field amplitude E m is equal to B m divided by the speed of light c . The rms value of the electric field is then E m divided by 2 . Eq. 33-26 then gives I = 1.9 kW/m 2 ....
View Full Document

## This note was uploaded on 07/19/2011 for the course PH 113 taught by Professor Liorburko during the Spring '09 term at University of Alabama - Huntsville.

### Page1 / 5

Sol4 - the magnetic field in the wave and also...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online