Introductory Physies- Namer .Date N : Forf.? credir ya\" should show all ehe sie

Question

Introductory Physies- Namer .Date N : Forf.? credir ya" should show all ehe sieps of your No creir is gained by just cireling the numerical answers mmual answers 1 which one of the follow ing will mot generate electromagnetie waves or pukest B) a proton in simple harmonic motion ) a stcady direct eurrent D) an alternating current E) charged particles traveling in a circular path in a mass spectromveter 2. An FMt radio station generates radio waves that have a frequency of 108.6 I ves from a competing station has a frequency of 107.5 MHz fference in wavelength between the waves emited from the two stations A) 0.009 m B) 0.018 m C)0.028 m D) 0.033 m E 0.045m 3. A laser uniformly illuminates an area with green light that has an average intensity of 580 Wm? What is the rms value of the magnetic field of this light? A) 0.23 x 10- T B) 1.13 x 106T C) 1.56 x 10 T E) 1.66×10-6 T D) 1.74 × 10-6 T 4. An AM radio station broadcasts radio waves uniformly in all directions with a total aves power of 100 kW. What is the maximum value of the electric field at a distance of 350 miles the station transmitter antenna? (1 kW -1000 W, 1 mile-1 609 m) A) 8.2 x 10-N/C B) 5.2 x 10- N/C C) 4.3 x 10 N/C D) 1.6 x 10- N/C E) zero tesla

Explanation / Answer

1) C) a steady direct current

2) C) 0.028 m

we know, v = lamda*f

lamda = v/f

so,

difference in wavelength = lamda2 - lamda1

= c/f2 - c/f1

= 3*10^8/(107.5*10^6) - 3*10^8/(108.6*10^6)

= 0.028 m

3) C) 1.56*10^-6 T

Erms = sqrt(I*c*mue)

we know, Brms = Erms/c

= sqrt(I*c*mue/c^2)

= sqrt(I*mue/c)

= sqrt(580*4*pi*10^-7/(3*10^8))

= 1.56*10^-6 T

4) C) 4.3*10^-3 N/C

I = Power/Area

= 100*10^3/(4*pi*(350*1609)^2)

= 2.51*10^-8 W/m^2

Emax = sqrt(2*I*c*mue)

= sqrt(2*2.51*10^-8*3*10^8*4*pi*10^-7)

= 4.3*10^-3 N/C

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