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Electromagnetic Waves — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Waves1 Mark
Question
Two waves having same velocity enter electric and magnetic fields respectively. If $\lambda_1$​ and $\lambda_2$​ are their wavelengths as they move in the fields, then.
✓

Answer

  1. $\lambda_1$ and $\lambda_2$ are variable
Explanation:
Velocity of a wave is given by:
$\text{v}=\frac{\text{E}}{\text{B}}$
Hence wave velocity change in both the cases.
Frequency of the wave remains the same.
Using $\text{v}=\text{f}\lambda,$ it can be concluded that both $\lambda_1$ and $\lambda_2$ are variable.

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