Answer: 1.24 MeV.
- A 1.24 MeV
- B 1.24 eV
- C 1240 keV
- D 0.124 MeV
Correct answer: A. 1.24 MeV
Explanation: E = hf = hc/λ = (6.63×10⁻³⁴ × 3×10⁸)/(10⁻¹²) = 1.99×10⁻¹³ J = 1.99×10⁻¹³/1.6×10⁻¹⁹ eV ≈ 1.24×10⁶ eV = 1.24 MeV.
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.