Explanation Given info: The power of laser beam is 7.7 mW and the length of the light beam is 1.0 m . The time taken by the beam to cross the length is, Δ t = L c Here, L is the length of the beam. c is the speed of light . Substitute 1.0 m for L and 3 × 10 8 m / s for c in the above equation. Δ t = 1.0 m 3 × 10 8 m / s = 0.33333333 × 10 − 8 s ≈ 3 .33 × 10 − 9 s The formula to calculate power of a laser beam is, P = E Δ t Here, E is the energy of the beam. P is the power of source. Rearrange the above equation to find E . E = P Δ t Substitute 3

Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)

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ISBN: 9780134032610

Author: James S. Walker

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Nature of light

Light is transverse and electromagnetic radiation that exhibits the properties of a wave as well as a particle. For this reason, light is said to have a “dual nature.”

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Chapter 25, Problem 55PCE

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The energy contained in 1 m light of a beam.

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Chapter 25, Problem 54PCE

Chapter 25, Problem 56PCE

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Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)

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The energy contained in 1 m light of a beam.

Solution Summary: The author explains the formula to calculate the power of a laser beam.

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The energy contained in 1 m light of a beam.

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