If the kinetic energy of an electron is 100 eV, what is the wavelength of the de-Broglie wave associated with it? [h = 6.6 x $10^{-34}$ J s, e = 1.6 x \(1...

Assessment: WAEC SSCE - Physics - 2022 (Objective) Subject: Physics

Question 1 Report

If the kinetic energy of an electron is 100 eV, what is the wavelength of the de-Broglie wave associated with it? [h = 6.6 x $10^{-34}$ J s, e = 1.6 x $10^{19}$ C, $m_e$, = 9.1 x $10^{-31}$ kg]

1.22 x 10

^{- 10}

m

4.10 x 10

^{- 10}

m

3.90 x 10

^{- 10}

m

5.50 x 10

^{- 14}

m

Answer Details

de broglie wavelength formula in terms of kinetic energy:

λ = $\frac{h}{\sqrt{2 m E}}$

λ = $\frac{6.6 * 10^{- 34}}{\sqrt{2 * 9.1 * 10^{- 31} * 100}}$

λ = 5.50 x 10 $^{- 14}$ m

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Thermal Expansion

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If the kinetic energy of an electron is 100 eV, what is the wavelength of the de-Broglie wave associated with it? [h = 6.6 x \(10^{-34}\) J s, e = 1.6 x \(1...

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