Answer: 9.3 × 10-6 Pa.
- A 2.3 × 10-6 Pa
- B 4.7 × 10-6 Pa
- C 1.4 × 10-5 Pa
- D 9.3 × 10-6 Pa
Correct answer: D. 9.3 × 10-6 Pa
Explanation: A perfect reflector reverses the momentum, doubling the pressure: P = 2I/c = 2 × 4.7 × 10-6 ≈ 9.3 × 10-6 Pa.
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.