p34_094

# p34_094 - 94(a The wave is traveling in the −y...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 94. (a) The wave is traveling in the −y direction (see §17-5 for the signiﬁcance of the relative sign between the spatial and temporal arguments of the wave function). (b) Figure 34-5 may help in visualizing this. The direction of propagation (along the y axis) is perpendicular to B (presumably along the x axis, since the problem gives Bx and no other component) and both are perpendicular to E (which determines the axis of polarization). Thus, the wave is z -polarized. (c) Since the magnetic ﬁeld amplitude is Bm = 4.00 µT, then (by Eq. 34-5) Em = 1199 V/m. Dividing √ by 2 yields Erms = 848 V/m. Then, Eq. 34-26 gives I= 1 2 E 2 = 1.91 × 103 W/m . cµ0 rms (d) Since kc = ω (equivalent to c = f λ), we have k= 2.00 × 1015 = 6.67 × 106 m−1 . c Summarizing the information gathered so far, we have (with SI units understood) Ez = 1199 sin 6.67 × 106 y + 2.00 × 1015 t . (e) and (f) Since λ = 2π/k = 942 nm, we see that this is infrared light. ...
View Full Document

## This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

Ask a homework question - tutors are online