What does “Speed and field ratio” actually mean in Electromagnetic Waves, and why does it matter for JEE?
In vacuum all electromagnetic frequencies travel at c. For a plane wave E_0/B_0 = c; frequency changes photon energy and wavelength, not vacuum speed.
In simple words: In vacuum all electromagnetic frequencies travel at c. For a plane wave E_0/B_0 = c; frequency changes photon energy and wavelength, not vacuum speed. Getting Speed and field ratio clear matters because JEE questions on Electromagnetic Waves usually test this idea directly, not just a formula you memorised.
Key point
Speed and field ratio
Common mistake
claiming gamma rays travel faster than radio waves in vacuum.
Memory tip
same vacuum speed, different frequency and wavelength.
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