Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![**Question 4:** A laser pulse with a wavelength of 532 nm contains 3.85 mJ of energy. How many photons are in the laser pulse?
*This question involves calculating the number of photons in a laser pulse given its wavelength and energy.*
**Explanation:**
1. **Wavelength (λ):** 532 nm
2. **Energy (E):** 3.85 mJ
To find the number of photons, use the formula:
\[ E_{\text{photon}} = \frac{hc}{λ} \]
where:
- \( h \) is Planck’s constant (\(6.626 \times 10^{-34} \, \text{J s}\)),
- \( c \) is the speed of light (\(3 \times 10^8 \, \text{m/s}\)).
Then, divide the total energy by the energy of one photon:
\[ n = \frac{E_{\text{total}}}{E_{\text{photon}}} \]
Convert energy into Joules if needed (1 mJ = \(1 \times 10^{-3} \) J).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3a6f2e6d-caf3-4f31-a0f0-c8e5156c1788%2Fae87a243-9613-464a-b770-b28d489ec203%2Fqr9u8d4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Question 4:** A laser pulse with a wavelength of 532 nm contains 3.85 mJ of energy. How many photons are in the laser pulse?
*This question involves calculating the number of photons in a laser pulse given its wavelength and energy.*
**Explanation:**
1. **Wavelength (λ):** 532 nm
2. **Energy (E):** 3.85 mJ
To find the number of photons, use the formula:
\[ E_{\text{photon}} = \frac{hc}{λ} \]
where:
- \( h \) is Planck’s constant (\(6.626 \times 10^{-34} \, \text{J s}\)),
- \( c \) is the speed of light (\(3 \times 10^8 \, \text{m/s}\)).
Then, divide the total energy by the energy of one photon:
\[ n = \frac{E_{\text{total}}}{E_{\text{photon}}} \]
Convert energy into Joules if needed (1 mJ = \(1 \times 10^{-3} \) J).
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