Dual Nature of Matter and Radiation — Easy Practice (Set 2)

Quick Recap — Photons & Matter Waves

• Photon: energy $h\nu$, momentum $p = \dfrac{h}{\lambda} = \dfrac{E}{c}$, zero rest mass, and it travels at $c$.
• de Broglie wavelength: $\lambda = \dfrac{h}{p} = \dfrac{h}{mv} = \dfrac{h}{\sqrt{2mKE}}$.
• Electron accelerated through a potential $V$: $\lambda \approx \dfrac{12.27}{\sqrt{V}}$ Å (with $V$ in volts).
• The wave nature of electrons was confirmed by the Davisson-Germer experiment.
• Matter waves matter only for very small particles; for everyday objects the wavelength is immeasurably small.