Two waves having same velocity enter electric and magnetic fields… - Vidyadip

MCQ

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.

A
$\lambda_1,\lambda_2$ are constants
B
$\lambda_1$ and $\lambda_2$ are variable
C
$\lambda_1$ is variable $\lambda_2$ is constant
D
$\lambda_2$ is variable, $\lambda_1$ is constant

✓

Answer

$\lambda_1$ 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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