Planck's constant is h = 6.6 × 10^-34 Js and the electron mass is 9.1 × 10^-31 kg. The de Broglie wavelength of an electron whose speed is 10⁸ m/s is A) 5.9 × 10^-56 m. B) 1.5 × 10^-19 m. C) 7.3 × 10^-12 m. D) 1.4 × 10¹¹ m.

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The de Broglie wavelength λ is given by λ = h / (mv), where h is Planck's constant, m is the mass of the electron, and v is its velocity. Substituting the given values, λ = 6.6 × 10^-34 Js / (9.1 × 10^-31 kg × 10^8 m/s) = 7.3 × 10^-12 m.

Planck's Constant Is H = 6