The reactance of a capacitor is 4.0 k ohm at a frequency of 0.60 kHz. What is th

Question

The reactance of a capacitor is 4.0 k ohm at a frequency of 0.60 kHz. What is the capacitance? 0.42 mu F 2.6 mu F 0.093 mu F 0.066 mu F What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 times 10^8 226 m 326 m 175 m 276 m 22.6 m Which one of the following lists gives the correct order of the electromagnetic waves from longer wavelength to shorter wavelength? radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays radio waves, infrared, microwaves, ultraviolet, visible, x-rays, gamma rays radio waves, infrared, x-rays, microwaves, ultraviolet, visible, gamma rays radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays If a diffraction grating is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order maximum? It moves away from the centerline. It doesn't change. It moves toward the centerline.

Explanation / Answer

a)

Capacitive reactance is given by :

Xc = 1/(2*pi*f*C)

So, 4000 = 1/(2*pi*600*C)

So, C = 6.63*10^-8 F= 0.066 uF <---- option d

b)

wavelenngth = speed of light / frequency

= 3*10^8 / (920*10^3)

= 326.1 m <---- option b

c)

radiowaves, microwaves,infrared,visible,ultraviolet,x-rays,gamma rays <---- option b

d)

As angular separation between fringes is inversely proportional to slit width , so heat will cause the angular location of first order maximum to mave towards the centerline <---- option c

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