Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 year ago

The red light emitted by a helium-neon laser has a wavelength of 632.8 nm. What is the frequency and energy per photon of that light?

2 Answers

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  • Anonymous
    1 year ago
    Favorite Answer

    Frequency = speed of light / wavelength

    energy per mole = Avogadro's number * Planck's constant * speed of light / wavelength

  • MyRank
    Lv 6
    11 months ago

    Given,

    Wavelength (λ) = 632.8nm

    Speed of light (c) = 3 x 10⁸m/sec

    Planck’s constant (h) = 6.626 x 10⁻³⁴J.sec

    Frequency (f) = ?

    Energy (E) = ?

    We know that:-

    Frequency (f) = speed of light (c) / wavelength (λ)

    = 3 x 10⁸m/sec / 632.8 x 10⁹m

    = 4.7 x 10⁻⁴/sec

    = 4.7 x 10⁻⁴Hz

    ∴ frequency (f) = 4.7 x 10⁻⁴Hz

    Now, Energy (E) = hf = 6.626 x 10⁻³⁴ x 4.7 x 10⁻⁴

    = 31.14 x 10⁻³⁸

    ≈ 31 x 10⁻³⁸J

    ∴ Energy (E) = 31 x 10⁻³⁸J.

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