Planck's Constant Is H = 6

question 22

Multiple Choice

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.