Planck's constant is h = 6.6 * 10^-34 Js and the electron mass is 9.1 * 10^-31 kg.The speed of an electron whose de Broglie wavelength is 10^-10 is A)6.6 * 10^-24 m/s. B)3.8 * 10³ m/s. C)7.3 * 10⁶ m/s. D)10¹⁰ m/s.

Question

Quizplus · Accepted Answer

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 the velocity. Solving for v gives v = h / (mλ). Substituting the given values, v = (6.6 * 10^-34) / (9.1 * 10^-31 * 10^-10) = 7.3 * 10^6 m/s.

Planck's Constant Is H = 6