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Question: Answered & Verified by Expert
If $\lambda_v, \lambda_x$ and $\lambda_m$ represent the wavelengths of visible light, X-rays and microwaves respectively, then
PhysicsElectromagnetic WavesJIPMERJIPMER 2007
Options:
  • A $\lambda_m\gt\lambda_x\gt\lambda_v$
  • B $\lambda_v\gt\lambda_m\gt\lambda_x$
  • C $\lambda_m\gt\lambda_v\gt\lambda_x$
  • D $\lambda_v\gt\lambda_x\gt\lambda_m$
Solution:
1323 Upvotes Verified Answer
The correct answer is: $\lambda_m\gt\lambda_v\gt\lambda_x$
Wavelength order of given rays are listed below:
$\begin{array}{l|l}
\hline \text{Rays} & \text{Wavelength} \\
\hline \text{Visible light} & 4000-7900 \\
\text{X-rays} & 1-100 \\
\text{Microwaves} & 10^7-10^9 \\
\hline
\end{array}$
Obviously, $\lambda_x \lt \lambda_v \lt \lambda_m$
or $\lambda_m\gt\lambda_v\gt\lambda_x$
NOTE : Visible light, X-rays and microwaves are all electromagnetic waves.

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