32. Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0.500 mW. (a) If such a laser beam is

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32. Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0.500 mW. (a) If such a laser beam is projected onto a circular spot 1.00 mm in diameter, what is its intensity

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Thông Đạt 4 years 2021-09-01T12:18:55+00:00 1 Answers 4 views 0

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  1. Xavia
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    2021-09-01T12:20:15+00:00
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    Answer:

    636.6 W/m²

    Explanation:

    From the given information:

    The area of the circular spot can be calculated as:

    A = πr²

    A = π(0.5 × 10⁻³ m)²

    A = 7.85 × 10⁻⁷ m²

    The intensity can be determined by using the formula:

    I = \dfrac{P}{A}

    I = \Big ( \dfrac{0.500 \ mW}{\pi (0.5 \times 10^{-3} \ m )^2} \Big) \Big( \dfrac{10^{-3} \ W}{1\ mW} \Big)

    I = \dfrac{0.500 \times 10^{-3} }{\pi(0.25 \times 10^{-6} )}

    I = 636.6 W/m²

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