
The equations for the electric field and the magnetic field of the wave.

Answer to Problem 77PQ
The equation for the electric field is E=(1.44×104 V/m)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t] and the equation for the magnetic field is B=(48.0×10−6 T)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t].
Explanation of Solution
Write the expression for the frequency of an
f=cλ (I)
Here c is the
Write the expression for the angular frequency of the wave.
ω=2πf (II)
Here, ω is the angular frequency and f is the frequency of the wave.
Write the expression for the wave number of the wave.
k=2πλ (III)
Here, k is the wave number and λ is the wavelength of the wave.
Write the expression for the maximum electric field.
Emax=cBmax (IV)
Here, Emax is the maximum electric field, c is the speed of light and Bmax is the maximum magnetic field.
Write the expression for the electric field of an electromagnetic wave.
EZ=Emaxsin(kx−ωt) V/m (V)
Write the expression for the magnetic field of an electromagnetic wave.
BZ=Bmaxsin(kx−ωt) T (VI)
Conclusion:
Substitute 3×108 m/s for c and 625 nm for λ in equation (I) to find f.
f=3×108 m/s(625 nm×10−9 m1 nm)
=4.8×1014 Hz
Substitute equation (I) in the equation (II) to find ω.
ω=2π(4.8×1014)=3.01×1015 rad/s
Substitute 625 nm for λ in the (III)equation to find k.
k=2π(625 nm×10−9 m1 nm)=1.01×107 m−1
Substitute 48.0 μT for Bmax and 3×108 m/s for c in (IV) to find Emax.
Emax=(3.0×108 m/s)(48.0 μT×10−9 T1 μT)=1.44×104 V/m
Substitute 1.44×104 V/m for Emax, 1.01×107 m−1 for k, and 3.01×1015 rad/s for ω in the (V) equation to find EZ
EZ=(1.44×104 V/m)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t]
Substitute 48.0 μT for Bmax, 1.01×107 m−1 for k, and 3.01×1015 rad/s for ω in(VI) equation to find BZ
EZ=(1.01×10−6 T)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t]
Therefore, the equation for the electric field is E=(1.44×104 V/m)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t] and the equation for the magnetic field is B=(48.0×10−6 T)sin[(1.01×107 m−1)z−(3.02×1015 rad/s)t].
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Chapter 34 Solutions
Physics for Scientists and Engineers: Foundations and Connections
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