Answer: 1 10 10 Hz.
- A 1 × 10<sup>10</sup> Hz
- B 1 × 10<sup>9</sup> Hz
- C 1 × 10<sup>11</sup> Hz
- D 3 × 10<sup>8</sup> Hz
Correct answer: A. 1 × 10<sup>10</sup> Hz
Explanation: f = c/λ = (3 × 10<sup>8</sup>)/(0.03) = 1 × 10<sup>10</sup> Hz.
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.