Answer: 12.2 cm.
- A 12.2 cm
- B 2.45 cm
- C 1 m
- D 3 mm
Correct answer: A. 12.2 cm
Explanation: λ = c/f = 3×10⁸/(2.45×10⁹) = 3/2.45 × 10⁻¹ ≈ 0.122 m = 12.2 cm.
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.