Physics
Physics
5th Edition
ISBN: 9781260486919
Author: GIAMBATTISTA
Publisher: MCG
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Question
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Chapter 22, Problem 70P

(a)

To determine

The intensity of laser beam.

(a)

Expert Solution
Check Mark

Answer to Problem 70P

Intensity is 1.1kW/m2.

Explanation of Solution

Write the equation for intensity of laser beam.

    I=PA

Here, I is the intensity of laser beam, P is the power, and A is the area of cross section of beam.

Write the equation to find A.

    A=14πd2

Here, d is the diameter of beam.

Rewrite the equation for I by substituting the above relation for A.

  I=P14πd2=4Pπd2                                                                                                                 (I)

Conclusion:

Substitute 2.0mW for P, 3.14 for π and 1.5mm for d in the above equation to find I.

  I=4(2.0mW(103W1mW))(3.14)(1.5mm(103m1mm))2=8.0×103W7.065×103m=1100W/m2(1kW103m2)=1.1kW/m2

Therefore, the rms current is 20A.

(b)

To determine

The intensity of light incident on the retina.

(b)

Expert Solution
Check Mark

Answer to Problem 70P

Intensity is 6.4MW/m2.

Explanation of Solution

Conclusion:

Substitute 2.0mW for P, 3.14 for π and 20.0μm for d in equation (I) to find I.

  I=4(2.0mW(103W1mW))(3.14)(20.0μm(106m1μm))2=8.0×103W1.256×109m=6.4×106W/m2(1MW106W)=6.4MW/m2

Therefore, the rms current is 20A.

(c)

To determine

Total energy incident on the retina.

(c)

Expert Solution
Check Mark

Answer to Problem 70P

Total energy is 0.16mJ.

Explanation of Solution

Write the equation for total energy incident on the retina.

  U=PΔt

Here, U is the total energy incident on the retina, P is the power, and Δt is the time duration.

Conclusion:

Substitute 2.0mW for P and 80ms for Δt in the above equation to find U.

  U=(2.0mW(103W1mW))(80ms(103s1ms))=160×106J(1mJ103J)=0.16mJ

Therefore, the total energy is 0.16mJ.

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Chapter 22 Solutions

Physics

Ch. 22.7 - Prob. 22.7PPCh. 22.7 - Prob. 22.8PPCh. 22.8 - Prob. 22.9PPCh. 22 - Prob. 1CQCh. 22 - Prob. 2CQCh. 22 - Prob. 3CQCh. 22 - Prob. 4CQCh. 22 - Prob. 5CQCh. 22 - Prob. 6CQCh. 22 - Prob. 7CQCh. 22 - Prob. 8CQCh. 22 - Prob. 9CQCh. 22 - Prob. 10CQCh. 22 - Prob. 11CQCh. 22 - Prob. 12CQCh. 22 - Prob. 13CQCh. 22 - Prob. 14CQCh. 22 - Prob. 15CQCh. 22 - Prob. 1MCQCh. 22 - Prob. 2MCQCh. 22 - Prob. 3MCQCh. 22 - Prob. 4MCQCh. 22 - 5. If the wavelength of an electromagnetic wave is...Ch. 22 - Prob. 6MCQCh. 22 - 7. A dipole radio transmitter has its rod-shaped...Ch. 22 - Prob. 8MCQCh. 22 - Prob. 9MCQCh. 22 - Prob. 10MCQCh. 22 - Prob. 1PCh. 22 - Prob. 2PCh. 22 - Prob. 3PCh. 22 - Prob. 4PCh. 22 - Prob. 5PCh. 22 - 6. What is the wavelength of the radio waves...Ch. 22 - Prob. 7PCh. 22 - Prob. 8PCh. 22 - Prob. 9PCh. 22 - Prob. 10PCh. 22 - Prob. 12PCh. 22 - 12. In order to study the structure of a...Ch. 22 - Prob. 13PCh. 22 - 14. When the NASA Rover Spirit successfully landed...Ch. 22 - Prob. 15PCh. 22 - 16. You and a friend are sitting in the outfield...Ch. 22 - Prob. 14PCh. 22 - Prob. 18PCh. 22 - Prob. 17PCh. 22 - Prob. 20PCh. 22 - Prob. 21PCh. 22 - Prob. 22PCh. 22 - Prob. 23PCh. 22 - Prob. 24PCh. 22 - Prob. 25PCh. 22 - Prob. 26PCh. 22 - Prob. 27PCh. 22 - Prob. 28PCh. 22 - Prob. 29PCh. 22 - 30. The intensity of the sunlight that reaches...Ch. 22 - Prob. 31PCh. 22 - Prob. 32PCh. 22 - Prob. 33PCh. 22 - Prob. 34PCh. 22 - Prob. 35PCh. 22 - 36. The intensity of the sunlight that reaches...Ch. 22 - Prob. 37PCh. 22 - Prob. 38PCh. 22 - Prob. 39PCh. 22 - Prob. 40PCh. 22 - Prob. 41PCh. 22 - Prob. 42PCh. 22 - Prob. 43PCh. 22 - Prob. 44PCh. 22 - Prob. 45PCh. 22 - Prob. 46PCh. 22 - Prob. 47PCh. 22 - Prob. 48PCh. 22 - Prob. 49PCh. 22 - Prob. 50PCh. 22 - Prob. 51PCh. 22 - Prob. 52PCh. 22 - Prob. 53PCh. 22 - Prob. 54PCh. 22 - Prob. 55PCh. 22 - Prob. 56PCh. 22 - Prob. 57PCh. 22 - Prob. 58PCh. 22 - Prob. 59PCh. 22 - Prob. 60PCh. 22 - Prob. 62PCh. 22 - Prob. 61PCh. 22 - Prob. 63PCh. 22 - Prob. 64PCh. 22 - Prob. 65PCh. 22 - Prob. 66PCh. 22 - Prob. 67PCh. 22 - Prob. 68PCh. 22 - Prob. 69PCh. 22 - Prob. 70PCh. 22 - Prob. 71PCh. 22 - Prob. 72PCh. 22 - Prob. 73PCh. 22 - Prob. 74PCh. 22 - Prob. 75PCh. 22 - Prob. 76PCh. 22 - Prob. 77PCh. 22 - Prob. 78PCh. 22 - Prob. 80PCh. 22 - Prob. 82PCh. 22 - Prob. 79PCh. 22 - Prob. 81PCh. 22 - Prob. 84PCh. 22 - Prob. 83PCh. 22 - Prob. 86PCh. 22 - Prob. 85P
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