Answer: 6.2 eV.
- A 6.2 eV
- B 12.4 eV
- C 1.24 eV
- D 62 eV
Correct answer: A. 6.2 eV
Explanation: E = hc/λ = (4.136×10⁻¹⁵ eV·s × 3×10⁸ m/s)/(200×10⁻⁹ m) = 1.24×10⁻⁶/200×10⁻⁹ = 6.2 eV. UV photons have enough energy to break chemical bonds (≥ 3.5 eV).
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.