Physics for Scientists and Engineers
Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
Question
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Chapter 33, Problem 51CP

(a)

To determine

The wavelength of the wave.

(a)

Expert Solution
Check Mark

Answer to Problem 51CP

The wavelength of the wave is 3.33m .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the wavelength is,

λ=cf

Here,

c is the speed of the light.

f is the frequency of the wave.

Substitute 3×108m/s for c and 90.0MHz for f in the above equation to find the value of λ .

λ=3×108m/s90.0MHz×106Hz1MHz=3.33m

Conclusion:

Therefore, the wavelength of the wave is 3.33m .

(b)

To determine

The time period of the wave.

(b)

Expert Solution
Check Mark

Answer to Problem 51CP

The time period of the wave is 11.1ns .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the time period is,

T=1f

Substitute 90.0MHz for f in the above equation to find the value of T .

T=1(90.0MHz×106Hz1MHz)=11.1×109s×109ns1s=11.1ns

Conclusion:

Therefore, the time period of the wave is 11.1ns .

(c)

To determine

The maximum value of the magnetic field.

(c)

Expert Solution
Check Mark

Answer to Problem 51CP

The maximum value of the magnetic field is 6.67pT .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the magnitude of the magnetic field is,

Bmax=Emaxc

Here,

Emax is the peak value of the electric field.

Substitute 2.00mV/m for Emax and 3×108m/s for c in the above equation to find the value of Bmax .

Bmax=(2.00mV/m×103V/m1mV/m)(3×108m/s)=6.67×1012T=6.67pT

Conclusion:

Therefore, the maximum value of the magnetic field is 6.67pT .

(d)

To determine

The expression for electric field and the magnetic field.

(d)

Expert Solution
Check Mark

Answer to Problem 51CP

The expression for electric field is E=(2.00×103)cos2π(x3.3390.0×106t)j^ and the expression for magnetic field is B=(6.67×1012)cos2π(x3.3390.0×106t)k^ .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the angular frequency is,

ω=2πf

Here,

f is the frequency of the wave.

Substitute the 90.0×106Hz for f in the above equation to find the value of ω ,

ω=2π(90.0×106Hz) (1)

The formula to calculate the angular constant is,

k=2πλ

Here,

λ is the wavelength of wave.

Substitute the 3.33m for λ in the above equation to find the value of k ,

k=2π3.33m (2)

The formula to calculate the electric field is,

E=Emaxcos(kxωt)

Substitute 2π(90.0×106Hz) for ω , 2π3.33m for k and 2.00mV/m for Emax in the above equation to find the value of E .

E=(2.00×103V/m)cos(2π3.33mx2π(90.0×106Hz)t)E=(2.00×103)cos2π(x3.3390.0×106t)j^

The electric field is in the same direction of wave propagation.

The formula to calculate the magnetic field is,

B=Bmaxcos(kxωt)

Substitute 2π(90.0×106Hz) for ω , 2π3.33m for k and (6.67×1012) for Bmax in the above equation to find the value of B .

B=(6.67×1012T)cos(2π3.33mx2π(90.0×106Hz)t)B=(6.67×1012)cos2π(x3.3390.0×106t)k^

The direction of propagation of the magnetic field is perpendicular to that of the electric field.

Conclusion:

Therefore, the expression for electric field is E=(2.00×103)cos2π(x3.3390.0×106t)j^ and the expression for magnetic field is B=(6.67×1012)cos2π(x3.3390.0×106t)k^ .

(e)

To determine

The average power per unit area the wave carries.

(e)

Expert Solution
Check Mark

Answer to Problem 51CP

The average power per unit area the wave carries is 5.31×109W/m2 .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the average power per unit area is,

I=12εcE2max

Here,

ε is the emissivity of space.

c is the speed of the light.

Emax is the maximum electric field.

Substitute 2.00mV/m for Emax , 8.85×1012C2/Nm2 for ε and 3×108m/s for c in the above equation to find the value of I .

I=12(8.85×1012C2/Nm2)(3×108m/s)(2.00×103V/m)2=5.31×109W/m2

Conclusion:

Therefore, the average power per unit area the wave carries is 5.31×109W/m2 .

(f)

To determine

The average energy density in the radiation.

(f)

Expert Solution
Check Mark

Answer to Problem 51CP

The average energy density in the radiation is 1.77×1017J/m2 .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the average energy density is,

e=Ic

Substitute 5.31×109W/m2 for I and 3×108m/s for c in the above equation to find the value of B .

e=5.31×109W/m23×108m/s=1.77×1017J/m2

Conclusion:

Therefore, the average energy density in the radiation is 1.77×1017J/m2 .

(g)

To determine

The radiation pressure exerted by the wave.

(g)

Expert Solution
Check Mark

Answer to Problem 51CP

The radiation pressure exerted by the wave is 3.54×1017J/m2 .

Explanation of Solution

Given info: The frequency of the wave is 90.0MHz and the peak value of the electric field is 2.00mV/m in positive y direction.

The formula to calculate the radiation pressure is,

P=2Ic=2e

Substitute 1.77×1017J/m2 for e in above equation to find the value of P .

P=2(1.77×1017J/m2)=3.54×1017J/m2

Conclusion:

Therefore, the radiation pressure exerted by the wave is 3.54×1017J/m2 .

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Chapter 33 Solutions

Physics for Scientists and Engineers

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