Explanation Given data : Consider that the wavelength of UV laser as 193 nm and this laser emits 0.500 mJ pulse for an eye surgery. Explanation: Write the expression to find the number of photons placed in the light pulse. Number of photons = Total energy energy / photon (1) Consider the expression for the energy of the single photon. E = h f (2) Here, h is Planck's constant, which is generally known as 6.63 × 10 − 34 J ⋅ s . Write the expression for the frequency of the photon f . f = c λ (3) Here, λ is wavelength of photon, which is given as 500 nm, and c is the velocity of light in vacuum, which is generally 3 × 10 8 m/s . Substitute equation (3) in equation (2), E = h c λ (4) Substitute h c λ for energy photon in equation (1), Number of photons = Total energy h c λ Substitute 6.63 × 10 − 34 J ⋅ s for h , 3 × 10 8 m s for c , 193 nm for λ , and 0

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Chapter 25, Problem 48P

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To find: The number of photons in the light pulse.

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Chapter 25, Problem 47P

Chapter 25, Problem 49P

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Chapter 25 Solutions

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The number of photons in the light pulse.

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Chapter 25 Solutions