32. The reactance of an inductor is 10 A) 1.00 m B) 1.59 mll C) 2.06ml D) 080 mH

Question

32. The reactance of an inductor is 10 A) 1.00 m B) 1.59 mll C) 2.06ml D) 080 mH E) 3.45 mH at 2 MHz. The inductance of this bctor is 33. Which of the following statcmentsmanatic Both the & and the E components of an electromagnetic wave equation The phase ofa wave traveling in the negative : direction ?sbi..iven by (p.a B) C) D) E) The speed of an electromagnctie The magnitude of All of these statements are true. given wave traveling in a vacuam & is greater than the magnitude of B by a factor of e. 34. What is the frequency of the light with wavelength 455-om? A) 16.7 kHz B) 5.40 x 10" Hz C) 5.40x 1015 Hz D) 6.60 x 10 Hz E) 5.40 x 107 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 ?m C) 3.0 ?m D) 9.0 jam A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions. 16 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 E) 12.0 ?m 36.

Explanation / Answer

32.

reactance is given by

XL = w*L = 2*pi*f*L

L = XL/(2*pi*f)

L = 10/(2*pi*2*10^3) = 0.79*10^-3 H

L = 0.8 mH

Correct option is D.

34.

frequency = speed of light/wavelength

f = 3*10^8/(455*10^-9)

f = 6.59*10^14 Hz

Correct option is D.

35.

distance = speed*time

t = 10 fs = 10*10^-15 sec = 1*10^-14 sec

speed = c = 3*10^8

distance = 3*10^8*10^-14 = 3*10^-6 m = 3 um

Correct option is C.

36.

Power = Intensity*Area

I = P/A

Given that P = 50% of P_input = 50% of 60 = 30 W

A = 4*pi*r^2 = 4*pi*3^2

I = 30/(36*pi)

I = 0.26 W/m^2

Correct option is B.

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