Answer: p = hf/c = h/λ.
- A p = hf/c = h/λ
- B p = hf
- C p = hf²/c
- D p = hc/f
Correct answer: A. p = hf/c = h/λ
Explanation: Photon momentum p = E/c = hf/c = h/λ. This momentum causes radiation pressure and is used in laser cooling of atoms and solar sail propulsion concepts.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.