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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Electromagnetic Waves
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What is order of energy of X-rays $(E_X)$, radio waves $(E_R)$, and micro waves $(E_M)$?

$\begin {array} {1 1} (a)\;E_X < E_R < E_M & \quad (b)\;E_X > E_M > E_R \\ (c)\;E_X < E_R > E_M & \quad (d)\;E_X > E_R > E_M \end {array}$


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$ \lambda$ of X-rays ranges from $1 \: A^{\circ}\: to\: 100\: A^{\circ},\lambda$ of microwaves ranges from $10^7A^{\circ}\: to 10^9A^{\circ} $ and $ \lambda$ of
radio waves ranges from $ 10^9A^{\circ}\: to\: 10^{14}A^{\circ}$
So, $\lambda_X < \lambda_M < \lambda_R$
Lesser the wavelength, more is the energy
So,$ E_X > E_M > E_R$
Ans : (b)
answered Feb 28, 2014 by thanvigandhi_1

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