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The wavelength of a photon is 400 nm. What is the energy of the photon? (Planck’s constant, h=6.626×10−34 J⋅s; speed of light, c=3×10m/s
  • a)
    3.1eV
  • b)
    2.48eV
  • c)
    4.96eV
  • d)
    5.0eV
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The wavelength of a photon is 400 nm. What is the energy of the photon...
Energy (E) = (Planck’s constant × speed of light) / wavelength.
  1. Convert wavelength: 400 nm = 400 × 10⁻⁹ m.
  2. E = (6.626 × 10⁻³⁴ × 3 × 10⁸) / (400 × 10⁻⁹).
  3. E = 4.97 × 10⁻¹⁹ J. Convert to eV: E = 4.97 × 10⁻¹⁹ / 1.6 × 10⁻¹⁹ ≈ 3.1 eV.
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The wavelength of a photon is 400 nm. What is the energy of the photon...
Energy (E) = (Planck’s constant × speed of light) / wavelength.
  1. Convert wavelength: 400 nm = 400 × 10⁻⁹ m.
  2. E = (6.626 × 10⁻³⁴ × 3 × 10⁸) / (400 × 10⁻⁹).
  3. E = 4.97 × 10⁻¹⁹ J. Convert to eV: E = 4.97 × 10⁻¹⁹ / 1.6 × 10⁻¹⁹ ≈ 3.1 eV.
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