College Physics : Wave-Particle Duality

Study concepts, example questions & explanations for College Physics

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Example Questions

Example Question #1 : Quantum Physics

A car with mass \(\displaystyle 2000kg\) is heading toward a wall at a speed \(\displaystyle 25\frac{m}{s}\). What is the approximate de Broglie wavelength of the car?

\(\displaystyle h = 6.626\times 10^{-34}~\text{J}\cdot\text{s}\)

Possible Answers:

\(\displaystyle 2\times10^{-34}~\text{m}\)

\(\displaystyle 1.33\times10^{-38}~\text{m}\)

\(\displaystyle 0.0125~\text{m}\)

\(\displaystyle 80~\text{m}\)

\(\displaystyle 532\times10^{-9}~\text{m}\)

Correct answer:

\(\displaystyle 1.33\times10^{-38}~\text{m}\)

Explanation:

The de Broglie wavelength is given by \(\displaystyle \lambda = \frac{h}{m v}\).

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