{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

q04sol

# q04sol - SOLUTIONS Quiz Number 4 PHYSICS 109 Please BOX...

This preview shows pages 1–2. Sign up to view the full content.

SOLUTIONS Quiz Number 4 PHYSICS 109 October 12, 2001 Please BOX your answers. c = 3 × 10 8 m / s 1 / 4 π² 0 = 9 × 10 9 m / F μ 0 = 4 π × 10 - 7 N / A 2 . 1. The electric feld o± an electromagnetic wave propagating in the x direction is E = E 0 k sin( kx - ωt ), where E 0 = 3V / m and k = 20 π rad / m. (a) Give an expression ±or the magnetic feld o± this wave. Be sure your expression specifes the direction o± the magnetic feld and gives a numerical value ±or the strength o± the feld. (3 points) E × B must point in the direction of propagation, the x direction. This means B points in the negative y direction. Also, B 0 = E 0 /c . So B = - B 0 j sin( kx - ωt ) with B 0 = E 0 /c = 10 - 8 T . (b) What is the wavelength o± this wave? (1 point) λ = 2 π/k = 0 . 1m . (c) What is the ±requency (Hz) o± this wave? (1 point) c = c/λ = 3GHz . Also ω = 6 π × 10 9 rad /s . (d) What is the average intensity o± this wave? (2 points) h S i = E 0 B 0 / 2 μ 0 = 0 . 012W / m 2 . Rewrite and sign the Honor Pledge:

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

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

{[ snackBarMessage ]}

### Page1 / 2

q04sol - SOLUTIONS Quiz Number 4 PHYSICS 109 Please BOX...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online