If an Electron Has the Same De Broglie Wavelength as the Wavelength

question 10

Multiple Choice

If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,what is the speed of the electron? (m_electron = 9.11 × 10^-31 kg,c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

• A)1,900 m/s
• B)2,100 m/s
• C)1,700m/s
• D)1,500 m/s
• E)540 m/s

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