What is the wavelength of a 3.0-ev photon? (b) what is the de broglie wavelength of a 3.0-ev electron?
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For photon
λ = hc / E
= (6.626 × 10⁻³⁴ J s × 3 × 10⁸ m/s) / (3 × 1.6 × 10⁻¹⁹ J)
= 414.125 nanometers
For electron
λ = h / (mv)
= h / sqrt(2 m K)
= 6.626 × 10⁻³⁴ J s / sqrt(2 × 9.1 × 10⁻³¹ kg × 3 × 1.6 × 10⁻¹⁹ J)
= 0.709 nanometers
λ = hc / E
= (6.626 × 10⁻³⁴ J s × 3 × 10⁸ m/s) / (3 × 1.6 × 10⁻¹⁹ J)
= 414.125 nanometers
For electron
λ = h / (mv)
= h / sqrt(2 m K)
= 6.626 × 10⁻³⁴ J s / sqrt(2 × 9.1 × 10⁻³¹ kg × 3 × 1.6 × 10⁻¹⁹ J)
= 0.709 nanometers
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