The sound of thunder is heard after the flash of lightning because
A. Light travels much faster than sound
B. Both travel at same speed
C. Light travels slower than sound
D. Sound travels faster than light
Answer: Option A
Solution (By JKSSB Mock Tests)
Speed of light ≈ 3×10⁸ m/s, sound ≈ 340 m/s. Light reaches almost instantly, sound takes time. So thunder heard after lightning. Time delay gives distance: d = v_sound × t.
Explanation:
Gamma rays have wavelengths < 10⁻¹² m, shortest in EM spectrum. X-rays 10⁻¹⁰-10⁻⁸ m. UV 10⁻⁸-4×10⁻⁷ m. IR longer. So gamma rays shortest. Highest frequency, energy.
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