32. The reactance o A) 1.00 mH B) 1.59 mH C) 2.06 mH D) 0.80 mH E) 3.45 mH fan i

Question

32. The reactance o A) 1.00 mH B) 1.59 mH C) 2.06 mH D) 0.80 mH E) 3.45 mH fan inductor is 10 ? at 2 kHz. The inductance of this inductor is 33. Which of the following statements is true? A) Both the B and the E components of an electromagnetic wave satisfy the wave equation. The phase of a wave traveling in the negative z direction is kz + ot. The speed ofan electromagnetic wave traveling in a vacuun is given by (????) in The magnitude of E is greater than the magnitude of B by a factor of c. B) C) E) All of these statements are true. 34. What is the frequency of the light with wavelength 455-nm? A) 16.7 kHz B) 5.40 x 104 Hz C) 5.40 x 1015 Hz D) 6.60 x 104 Hz E) 5.40 x 1017 Hz 35. Ultra fast pulse lasers can emit pulses of the order 10 fs. The length of each pulse that is 10 fs long is A) 1.0?m B) 2.0 pam C) 3.0 pum D) 9.0 ?m E) 12.0 jam 36. A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions. 1f 50% of the power input to such a light bulb is emitted as electromagnetic radiation, what is the radiation intensity at a distance of 3.00 m from the light bulb? A) 15 W/m2 B) 0.26 W/m2 C) 2.4 W/m2 D) 0.60 W/m2 E) 0.40 W/m2

Explanation / Answer

32) Option D)

Inductive reactance = 2pi*f*L

10 = 2pi*2000*L =======> L = 7.96*10^-4 H = 0.8 mH

33) Option E)

34) Option D)

Frequency = c/lmbda = 3*10^8/(455*10^-9) = 6.6*10^14 Hz

35) Option C)

Pulse length = c/f = c*T = 3*10^8*10*10^-15 = 3*10^-6 m = 3 um

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