Chapter 25: Electromagnetic Waves Selected Solutions

Selected Solutions

5. Using the right-hand rule we get the following:

(a) +z

(b) -z

(c) -x

(d) -x

17. For the cause of receding objects, the Doppler effect is given by

33. The wavelength of the waves is l = c/f. Therefore, the length L is given by

39.

65. Using the law of Malus, with I₁ as the intensity after passing through the first polarizer and I₂ as the intensity after passing through the second, we have

I₁ = I₀cos²q₁

I₂ = I₁cos²q₂ = I₀cos²q₁cos²q₂

(a) For the three cases we have

case (c) is the smallest; (a) and (b) tie.

(b) Using the above expression for I₂ yields

Again, case (c) is the smallest; (a) and (b) tie. The results verify part (a).

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